641522428 has 24 divisors (see below), whose sum is σ = 1154118672. Its totient is φ = 311791104.

The previous prime is 641522389. The next prime is 641522437. The reversal of 641522428 is 824225146.

It is a junction number, because it is equal to n+sod(n) for n = 641522393 and 641522402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281100 + ... + 283372.

It is an arithmetic number, because the mean of its divisors is an integer number (48088278).

Almost surely, 2^641522428 is an apocalyptic number.

It is an amenable number.

641522428 is a deficient number, since it is larger than the sum of its proper divisors (512596244).

641522428 is a wasteful number, since it uses less digits than its factorization.

641522428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221 (or 4219 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 641522428 is about 25328.2930336807. The cubic root of 641522428 is about 862.4566623327.

The spelling of 641522428 in words is "six hundred forty-one million, five hundred twenty-two thousand, four hundred twenty-eight".