641998626 has 8 divisors (see below), whose sum is σ = 1283997264. Its totient is φ = 213999540.

The previous prime is 641998597. The next prime is 641998631. The reversal of 641998626 is 626899146.

It is a sphenic number, since it is the product of 3 distinct primes.

641998626 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53499880 + ... + 53499891.

It is an arithmetic number, because the mean of its divisors is an integer number (160499658).

Almost surely, 2^641998626 is an apocalyptic number.

641998626 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641998626 is a wasteful number, since it uses less digits than its factorization.

641998626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106999776.

The product of its digits is 1119744, while the sum is 51.

The square root of 641998626 is about 25337.6918048981. The cubic root of 641998626 is about 862.6700082432.

The spelling of 641998626 in words is "six hundred forty-one million, nine hundred ninety-eight thousand, six hundred twenty-six".