61915887 has 32 divisors (see below), whose sum is σ = 105960960. Its totient is φ = 35314560.

The previous prime is 61915877. The next prime is 61915901. The reversal of 61915887 is 78851916.

61915887 is a `hidden beast` number, since 61 + 9 + 1 + 588 + 7 = 666.

It is not a de Polignac number, because 61915887 - 2⁶ = 61915823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61915817) 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, 1083 + ... + 11180.

It is an arithmetic number, because the mean of its divisors is an integer number (3311280).

Almost surely, 2^61915887 is an apocalyptic number.

61915887 is a deficient number, since it is larger than the sum of its proper divisors (44045073).

61915887 is a wasteful number, since it uses less digits than its factorization.

61915887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12300 (or 12294 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 61915887 is about 7868.6648803974. The cubic root of 61915887 is about 395.6100960222.

The spelling of 61915887 in words is "sixty-one million, nine hundred fifteen thousand, eight hundred eighty-seven".