643825496 has 32 divisors (see below), whose sum is σ = 1284660000. Its totient is φ = 301441536.

The previous prime is 643825459. The next prime is 643825517. The reversal of 643825496 is 694528346.

It is a super-2 number, since 2×643825496² = 829022538599292032, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643825496.

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, 15170 + ... + 38958.

It is an arithmetic number, because the mean of its divisors is an integer number (40145625).

Almost surely, 2^643825496 is an apocalyptic number.

It is an amenable number.

643825496 is a deficient number, since it is larger than the sum of its proper divisors (640834504).

643825496 is a wasteful number, since it uses less digits than its factorization.

643825496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24011 (or 24007 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 47.

The square root of 643825496 is about 25373.7166374972. The cubic root of 643825496 is about 863.4875039921.

The spelling of 643825496 in words is "six hundred forty-three million, eight hundred twenty-five thousand, four hundred ninety-six".