61261740 has 72 divisors (see below), whose sum is σ = 186823728. Its totient is φ = 16248960.

The previous prime is 61261721. The next prime is 61261741. The reversal of 61261740 is 4716216.

61261740 is a `hidden beast` number, since 6 + 1 + 2 + 617 + 40 = 666.

It is not an unprimeable number, because it can be changed into a prime (61261741) 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, 37174 + ... + 38786.

It is an arithmetic number, because the mean of its divisors is an integer number (2594774).

Almost surely, 2^61261740 is an apocalyptic number.

61261740 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 61261740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93411864).

61261740 is an abundant number, since it is smaller than the sum of its proper divisors (125561988).

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

61261740 is a wasteful number, since it uses less digits than its factorization.

61261740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839 (or 1834 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 61261740 is about 7826.9879263993. The cubic root of 61261740 is about 394.2119415942.

Adding to 61261740 its reverse (4716216), we get a palindrome (65977956).

It can be divided in two parts, 61261 and 740, that added together give a square (62001 = 249²).

The spelling of 61261740 in words is "sixty-one million, two hundred sixty-one thousand, seven hundred forty".