776507664 has 40 divisors (see below), whose sum is σ = 2043833472. Its totient is φ = 253951360.

The previous prime is 776507663. The next prime is 776507671. The reversal of 776507664 is 466705677.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (776507663) 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, 150072 + ... + 155159.

Almost surely, 2^776507664 is an apocalyptic number.

It is an amenable number.

776507664 is an abundant number, since it is smaller than the sum of its proper divisors (1267325808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

776507664 is a wasteful number, since it uses less digits than its factorization.

776507664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305295 (or 305289 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 48.

The square root of 776507664 is about 27865.8871023336. The cubic root of 776507664 is about 919.1405268743.

The spelling of 776507664 in words is "seven hundred seventy-six million, five hundred seven thousand, six hundred sixty-four".