641475388 has 12 divisors (see below), whose sum is σ = 1125009760. Its totient is φ = 320044032.

The previous prime is 641475383. The next prime is 641475413. The reversal of 641475388 is 883574146.

It is a happy number.

It is a super-2 number, since 2×641475388² = 822981346819501088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641475383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171333 + ... + 175036.

Almost surely, 2^641475388 is an apocalyptic number.

It is an amenable number.

641475388 is a deficient number, since it is larger than the sum of its proper divisors (483534372).

641475388 is a wasteful number, since it uses less digits than its factorization.

641475388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346836 (or 346834 counting only the distinct ones).

The product of its digits is 645120, while the sum is 46.

The square root of 641475388 is about 25327.3644108502. The cubic root of 641475388 is about 862.4355817743.

The spelling of 641475388 in words is "six hundred forty-one million, four hundred seventy-five thousand, three hundred eighty-eight".