645134776 has 32 divisors (see below), whose sum is σ = 1421103600. Its totient is φ = 270685440.

The previous prime is 645134767. The next prime is 645134801. The reversal of 645134776 is 677431546.

It is a congruent number.

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, 280821 + ... + 283108.

Almost surely, 2^645134776 is an apocalyptic number.

It is an amenable number.

645134776 is an abundant number, since it is smaller than the sum of its proper divisors (775968824).

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

645134776 is a wasteful number, since it uses less digits than its factorization.

645134776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563959 (or 563955 counting only the distinct ones).

The product of its digits is 423360, while the sum is 43.

The square root of 645134776 is about 25399.5034597135. The cubic root of 645134776 is about 864.0724354851.

The spelling of 645134776 in words is "six hundred forty-five million, one hundred thirty-four thousand, seven hundred seventy-six".