645007476 has 12 divisors (see below), whose sum is σ = 1505017472. Its totient is φ = 215002488.

The previous prime is 645007471. The next prime is 645007477. The reversal of 645007476 is 674700546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645007471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26875300 + ... + 26875323.

Almost surely, 2^645007476 is an apocalyptic number.

It is an amenable number.

645007476 is an abundant number, since it is smaller than the sum of its proper divisors (860009996).

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

645007476 is a wasteful number, since it uses less digits than its factorization.

645007476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53750630 (or 53750628 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 645007476 is about 25396.9973815804. The cubic root of 645007476 is about 864.0155979266.

The spelling of 645007476 in words is "six hundred forty-five million, seven thousand, four hundred seventy-six".