764578138 has 16 divisors (see below), whose sum is σ = 1195451424. Its totient is φ = 366402960.

The previous prime is 764578117. The next prime is 764578147. The reversal of 764578138 is 831875467.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 764578091 and 764578100.

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, 72148 + ... + 82063.

It is an arithmetic number, because the mean of its divisors is an integer number (74715714).

Almost surely, 2^764578138 is an apocalyptic number.

764578138 is a deficient number, since it is larger than the sum of its proper divisors (430873286).

764578138 is a wasteful number, since it uses less digits than its factorization.

764578138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154317.

The product of its digits is 1128960, while the sum is 49.

The square root of 764578138 is about 27651.0060938115. The cubic root of 764578138 is about 914.4092807949.

The spelling of 764578138 in words is "seven hundred sixty-four million, five hundred seventy-eight thousand, one hundred thirty-eight".