645577464 has 64 divisors (see below), whose sum is σ = 1848176640. Its totient is φ = 184083840.

The previous prime is 645577463. The next prime is 645577481. The reversal of 645577464 is 464775546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645577463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87337 + ... + 94439.

It is an arithmetic number, because the mean of its divisors is an integer number (28877760).

Almost surely, 2^645577464 is an apocalyptic number.

It is an amenable number.

645577464 is an abundant number, since it is smaller than the sum of its proper divisors (1202599176).

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

645577464 is a wasteful number, since it uses less digits than its factorization.

645577464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7660 (or 7656 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 48.

The square root of 645577464 is about 25408.2164663323. The cubic root of 645577464 is about 864.2700309090.

The spelling of 645577464 in words is "six hundred forty-five million, five hundred seventy-seven thousand, four hundred sixty-four".