401277664 has 24 divisors (see below), whose sum is σ = 790859160. Its totient is φ = 200424576.

The previous prime is 401277659. The next prime is 401277697. The reversal of 401277664 is 466772104.

It is a super-2 number, since 2×401277664² = 322047527250593792, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

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, 26227 + ... + 38605.

It is an arithmetic number, because the mean of its divisors is an integer number (32952465).

Almost surely, 2^401277664 is an apocalyptic number.

It is an amenable number.

401277664 is a deficient number, since it is larger than the sum of its proper divisors (389581496).

401277664 is a wasteful number, since it uses less digits than its factorization.

401277664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13402 (or 13394 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 401277664 is about 20031.9161340097. The cubic root of 401277664 is about 737.5899583458.

The spelling of 401277664 in words is "four hundred one million, two hundred seventy-seven thousand, six hundred sixty-four".