461631638 has 48 divisors (see below), whose sum is σ = 794979360. Its totient is φ = 199815552.

The previous prime is 461631637. The next prime is 461631659. The reversal of 461631638 is 836136164.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (461631637) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1285703 + ... + 1286061.

It is an arithmetic number, because the mean of its divisors is an integer number (16562070).

Almost surely, 2^461631638 is an apocalyptic number.

461631638 is a deficient number, since it is larger than the sum of its proper divisors (333347722).

461631638 is a wasteful number, since it uses less digits than its factorization.

461631638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 530 counting only the distinct ones).

The product of its digits is 62208, while the sum is 38.

The square root of 461631638 is about 21485.6146758709. The cubic root of 461631638 is about 772.8558914260.

The spelling of 461631638 in words is "four hundred sixty-one million, six hundred thirty-one thousand, six hundred thirty-eight".