1641630402 has 20 divisors (see below), whose sum is σ = 3678468486. Its totient is φ = 547210080.

The previous prime is 1641630391. The next prime is 1641630407. The reversal of 1641630402 is 2040361461.

It can be written as a sum of positive squares in only one way, i.e., 1483097121 + 158533281 = 38511^2 + 12591^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1641630407) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5066599 + ... + 5066922.

Almost surely, 2^1641630402 is an apocalyptic number.

1641630402 is an abundant number, since it is smaller than the sum of its proper divisors (2036838084).

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

1641630402 is a wasteful number, since it uses less digits than its factorization.

1641630402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10133535 (or 10133526 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1641630402 is about 40517.0384159553. The cubic root of 1641630402 is about 1179.6643692579.

Adding to 1641630402 its reverse (2040361461), we get a palindrome (3681991863).

The spelling of 1641630402 in words is "one billion, six hundred forty-one million, six hundred thirty thousand, four hundred two".