641375390 has 32 divisors (see below), whose sum is σ = 1189486944. Its totient is φ = 248814720.

The previous prime is 641375347. The next prime is 641375393. The reversal of 641375390 is 93573146.

It is a happy number.

It is a super-2 number, since 2×641375390² = 822724781795304200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641375393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119852 + ... + 125088.

It is an arithmetic number, because the mean of its divisors is an integer number (37171467).

Almost surely, 2^641375390 is an apocalyptic number.

641375390 is a deficient number, since it is larger than the sum of its proper divisors (548111554).

641375390 is a wasteful number, since it uses less digits than its factorization.

641375390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5612.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 641375390 is about 25325.3902240420. The cubic root of 641375390 is about 862.3907651341.

The spelling of 641375390 in words is "six hundred forty-one million, three hundred seventy-five thousand, three hundred ninety".