644077462 has 24 divisors (see below), whose sum is σ = 1125846216. Its totient is φ = 275542848.

The previous prime is 644077429. The next prime is 644077471. The reversal of 644077462 is 264770446.

It is a super-2 number, since 2×644077462² = 829671554112722888, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52573 + ... + 63655.

It is an arithmetic number, because the mean of its divisors is an integer number (46910259).

Almost surely, 2^644077462 is an apocalyptic number.

644077462 is a deficient number, since it is larger than the sum of its proper divisors (481768754).

644077462 is a wasteful number, since it uses less digits than its factorization.

644077462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11692 (or 11685 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 40.

The square root of 644077462 is about 25378.6812502147. The cubic root of 644077462 is about 863.6001334325.

The spelling of 644077462 in words is "six hundred forty-four million, seventy-seven thousand, four hundred sixty-two".