61039980 has 120 divisors (see below), whose sum is σ = 196368480. Its totient is φ = 15863040.

The previous prime is 61039967. The next prime is 61039991. The reversal of 61039980 is 8993016.

61039980 is a `hidden beast` number, since 610 + 39 + 9 + 8 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 65961 + ... + 66879.

It is an arithmetic number, because the mean of its divisors is an integer number (1636404).

Almost surely, 2^61039980 is an apocalyptic number.

61039980 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 61039980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98184240).

61039980 is an abundant number, since it is smaller than the sum of its proper divisors (135328500).

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

61039980 is a wasteful number, since it uses less digits than its factorization.

61039980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981 (or 970 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 61039980 is about 7812.8087139005. The cubic root of 61039980 is about 393.7357001610.

The spelling of 61039980 in words is "sixty-one million, thirty-nine thousand, nine hundred eighty".