78750987 has 24 divisors (see below), whose sum is σ = 129333456. Its totient is φ = 42352128.

The previous prime is 78750967. The next prime is 78750989. The reversal of 78750987 is 78905787.

It is not a de Polignac number, because 78750987 - 2⁶ = 78750923 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (78750989) 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, 13258 + ... + 18255.

It is an arithmetic number, because the mean of its divisors is an integer number (5388894).

Almost surely, 2^78750987 is an apocalyptic number.

78750987 is a deficient number, since it is larger than the sum of its proper divisors (50582469).

78750987 is a wasteful number, since it uses less digits than its factorization.

78750987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31547 (or 31540 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 51.

The square root of 78750987 is about 8874.1752856251. The cubic root of 78750987 is about 428.6327348330.

The spelling of 78750987 in words is "seventy-eight million, seven hundred fifty thousand, nine hundred eighty-seven".