644286354 has 32 divisors (see below), whose sum is σ = 1298968704. Its totient is φ = 213037440.

The previous prime is 644286343. The next prime is 644286403. The reversal of 644286354 is 453682446.

It is a super-2 number, since 2×644286354² = 830209811901226632, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442692 + ... + 444144.

It is an arithmetic number, because the mean of its divisors is an integer number (40592772).

Almost surely, 2^644286354 is an apocalyptic number.

644286354 is an abundant number, since it is smaller than the sum of its proper divisors (654682350).

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

644286354 is a wasteful number, since it uses less digits than its factorization.

644286354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002.

The product of its digits is 552960, while the sum is 42.

The square root of 644286354 is about 25382.7964180466. The cubic root of 644286354 is about 863.6934864169.

The spelling of 644286354 in words is "six hundred forty-four million, two hundred eighty-six thousand, three hundred fifty-four".