645658446 has 8 divisors (see below), whose sum is σ = 1291316904. Its totient is φ = 215219480.

The previous prime is 645658427. The next prime is 645658457. The reversal of 645658446 is 644856546.

It is a sphenic number, since it is the product of 3 distinct primes.

645658446 is an admirable number.

It is a super-2 number, since 2×645658446² = 833749657782269832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645658395 and 645658404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53804865 + ... + 53804876.

It is an arithmetic number, because the mean of its divisors is an integer number (161414613).

Almost surely, 2^645658446 is an apocalyptic number.

645658446 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645658446 is a wasteful number, since it uses less digits than its factorization.

645658446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107609746.

The product of its digits is 2764800, while the sum is 48.

The square root of 645658446 is about 25409.8100347090. The cubic root of 645658446 is about 864.3061677493.

The spelling of 645658446 in words is "six hundred forty-five million, six hundred fifty-eight thousand, four hundred forty-six".