60991740 has 72 divisors (see below), whose sum is σ = 186207840. Its totient is φ = 16159104.

The previous prime is 60991739. The next prime is 60991741. The reversal of 60991740 is 4719906.

60991740 is a `hidden beast` number, since 609 + 9 + 1 + 7 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (60991739) and next prime (60991741).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 60991695 and 60991704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (60991741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29046 + ... + 31074.

It is an arithmetic number, because the mean of its divisors is an integer number (2586220).

Almost surely, 2^60991740 is an apocalyptic number.

60991740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 60991740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93103920).

60991740 is an abundant number, since it is smaller than the sum of its proper divisors (125216100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

60991740 is a wasteful number, since it uses less digits than its factorization.

60991740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2206 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 60991740 is about 7809.7208656904. The cubic root of 60991740 is about 393.6319494936.

The spelling of 60991740 in words is "sixty million, nine hundred ninety-one thousand, seven hundred forty".