641770632 has 24 divisors (see below), whose sum is σ = 1738128990. Its totient is φ = 213923520.

The previous prime is 641770631. The next prime is 641770651. The reversal of 641770632 is 236077146.

641770632 is a `hidden beast` number, since 6 + 4 + 17 + 7 + 0 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 497914596 + 143856036 = 22314^2 + 11994^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (641770631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4456669 + ... + 4456812.

Almost surely, 2^641770632 is an apocalyptic number.

It is an amenable number.

641770632 is an abundant number, since it is smaller than the sum of its proper divisors (1096358358).

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

641770632 is a wasteful number, since it uses less digits than its factorization.

641770632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8913493 (or 8913486 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 641770632 is about 25333.1922978530. The cubic root of 641770632 is about 862.5678756917.

The spelling of 641770632 in words is "six hundred forty-one million, seven hundred seventy thousand, six hundred thirty-two".