78550664 has 32 divisors (see below), whose sum is σ = 150903000. Its totient is φ = 38318592.

The previous prime is 78550657. The next prime is 78550669. The reversal of 78550664 is 46605587.

It can be written as a sum of positive squares in 4 ways, for example, as 75516100 + 3034564 = 8690^2 + 1742^2 .

It is not an unprimeable number, because it can be changed into a prime (78550669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96692 + ... + 97500.

Almost surely, 2^78550664 is an apocalyptic number.

It is an amenable number.

78550664 is a deficient number, since it is larger than the sum of its proper divisors (72352336).

78550664 is a wasteful number, since it uses less digits than its factorization.

78550664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 78550664 is about 8862.8812470889. The cubic root of 78550664 is about 428.2689810647.

The spelling of 78550664 in words is "seventy-eight million, five hundred fifty thousand, six hundred sixty-four".