61979500 has 96 divisors (see below), whose sum is σ = 150958080. Its totient is φ = 22040000.

The previous prime is 61979497. The next prime is 61979507. The reversal of 61979500 is 597916.

It is a self number, because there is not a number n which added to its sum of digits gives 61979500.

It is not an unprimeable number, because it can be changed into a prime (61979507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 324405 + ... + 324595.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^61979500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61979500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75479040).

61979500 is an abundant number, since it is smaller than the sum of its proper divisors (88978580).

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

61979500 is a wasteful number, since it uses less digits than its factorization.

61979500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 61979500 is about 7872.7060150878. The cubic root of 61979500 is about 395.7455342357.

The spelling of 61979500 in words is "sixty-one million, nine hundred seventy-nine thousand, five hundred".