78900987 has 32 divisors (see below), whose sum is σ = 117411840. Its totient is φ = 46732320.

The previous prime is 78900959. The next prime is 78900989.

78900987 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78900987 - 2⁶ = 78900923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78900989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472378 + ... + 472544.

It is an arithmetic number, because the mean of its divisors is an integer number (3669120).

Almost surely, 2^78900987 is an apocalyptic number.

78900987 is a deficient number, since it is larger than the sum of its proper divisors (38510853).

78900987 is a wasteful number, since it uses less digits than its factorization.

78900987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 78900987 is about 8882.6227545697. The cubic root of 78900987 is about 428.9047065850.

The spelling of 78900987 in words is "seventy-eight million, nine hundred thousand, nine hundred eighty-seven".