641625340 has 12 divisors (see below), whose sum is σ = 1347413256. Its totient is φ = 256650128.

The previous prime is 641625337. The next prime is 641625343. The reversal of 641625340 is 43526146.

It is an interprime number because it is at equal distance from previous prime (641625337) and next prime (641625343).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641625343) 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, 16040614 + ... + 16040653.

It is an arithmetic number, because the mean of its divisors is an integer number (112284438).

Almost surely, 2^641625340 is an apocalyptic number.

It is an amenable number.

641625340 is an abundant number, since it is smaller than the sum of its proper divisors (705787916).

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

641625340 is a wasteful number, since it uses less digits than its factorization.

641625340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32081276 (or 32081274 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 641625340 is about 25330.3245143050. The cubic root of 641625340 is about 862.5027778388.

The spelling of 641625340 in words is "six hundred forty-one million, six hundred twenty-five thousand, three hundred forty".