641623518 has 56 divisors (see below), whose sum is σ = 1452701928. Its totient is φ = 212436432.

The previous prime is 641623481. The next prime is 641623547. The reversal of 641623518 is 815326146.

It is a happy number.

641623518 is a `hidden beast` number, since 6 + 416 + 235 + 1 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 227505 + ... + 230307.

Almost surely, 2^641623518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641623518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726350964).

641623518 is an abundant number, since it is smaller than the sum of its proper divisors (811078410).

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

641623518 is a wasteful number, since it uses less digits than its factorization.

641623518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 2965 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 641623518 is about 25330.2885494816. The cubic root of 641623518 is about 862.5019614322.

The spelling of 641623518 in words is "six hundred forty-one million, six hundred twenty-three thousand, five hundred eighteen".