61500087 has 32 divisors (see below), whose sum is σ = 101295360. Its totient is φ = 36560160.

The previous prime is 61500083. The next prime is 61500107. The reversal of 61500087 is 78000516.

It is not a de Polignac number, because 61500087 - 2² = 61500083 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 61500087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61500083) 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, 13788 + ... + 17694.

It is an arithmetic number, because the mean of its divisors is an integer number (3165480).

Almost surely, 2^61500087 is an apocalyptic number.

61500087 is a deficient number, since it is larger than the sum of its proper divisors (39795273).

61500087 is a wasteful number, since it uses less digits than its factorization.

61500087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980 (or 3974 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 61500087 is about 7842.1991175945. The cubic root of 61500087 is about 394.7225247776.

The spelling of 61500087 in words is "sixty-one million, five hundred thousand, eighty-seven".