87785978 has 16 divisors (see below), whose sum is σ = 154558464. Its totient is φ = 36605520.

The previous prime is 87785933. The next prime is 87785983. The reversal of 87785978 is 87958778.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84218 + ... + 85253.

It is an arithmetic number, because the mean of its divisors is an integer number (9659904).

Almost surely, 2^87785978 is an apocalyptic number.

87785978 is a deficient number, since it is larger than the sum of its proper divisors (66772486).

87785978 is a wasteful number, since it uses less digits than its factorization.

87785978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169517.

The product of its digits is 7902720, while the sum is 59.

The square root of 87785978 is about 9369.4171643705. The cubic root of 87785978 is about 444.4351339763.

The spelling of 87785978 in words is "eighty-seven million, seven hundred eighty-five thousand, nine hundred seventy-eight".