61979860 has 24 divisors (see below), whose sum is σ = 130493160. Its totient is φ = 24728064.

The previous prime is 61979849. The next prime is 61979861. The reversal of 61979860 is 6897916.

It can be written as a sum of positive squares in 4 ways, for example, as 2782224 + 59197636 = 1668^2 + 7694^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 61979860.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61979861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4392 + ... + 11968.

It is an arithmetic number, because the mean of its divisors is an integer number (5437215).

Almost surely, 2^61979860 is an apocalyptic number.

It is an amenable number.

61979860 is an abundant number, since it is smaller than the sum of its proper divisors (68513300).

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

61979860 is a wasteful number, since it uses less digits than its factorization.

61979860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7995 (or 7993 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 61979860 is about 7872.7288788577. The cubic root of 61979860 is about 395.7463004467.

The spelling of 61979860 in words is "sixty-one million, nine hundred seventy-nine thousand, eight hundred sixty".