78087087 has 24 divisors (see below), whose sum is σ = 122850000. Its totient is φ = 47507328.

The previous prime is 78087049. The next prime is 78087089. The reversal of 78087087 is 78078087.

It is a de Polignac number, because none of the positive numbers 2^k-78087087 is a prime.

It is a super-2 number, since 2×78087087² = 12195186312291138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78087089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6664 + ... + 14162.

It is an arithmetic number, because the mean of its divisors is an integer number (5118750).

Almost surely, 2^78087087 is an apocalyptic number.

78087087 is a deficient number, since it is larger than the sum of its proper divisors (44762913).

78087087 is a wasteful number, since it uses less digits than its factorization.

78087087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7607 (or 7604 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 78087087 is about 8836.6898214207. The cubic root of 78087087 is about 427.4248231407.

The spelling of 78087087 in words is "seventy-eight million, eighty-seven thousand, eighty-seven".