645061432 has 32 divisors (see below), whose sum is σ = 1219121280. Its totient is φ = 319974400.

The previous prime is 645061421. The next prime is 645061433. The reversal of 645061432 is 234160546.

It is a super-2 number, since 2×645061432² = 832208502107781248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645061394 and 645061403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645061433) 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, 747033 + ... + 747895.

It is an arithmetic number, because the mean of its divisors is an integer number (38097540).

Almost surely, 2^645061432 is an apocalyptic number.

It is an amenable number.

645061432 is a deficient number, since it is larger than the sum of its proper divisors (574059848).

645061432 is a wasteful number, since it uses less digits than its factorization.

645061432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503 (or 1499 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 645061432 is about 25398.0596109230. The cubic root of 645061432 is about 864.0396893919.

The spelling of 645061432 in words is "six hundred forty-five million, sixty-one thousand, four hundred thirty-two".