642623488 has 48 divisors (see below), whose sum is σ = 1383831540. Its totient is φ = 296583168.

The previous prime is 642623483. The next prime is 642623497. The reversal of 642623488 is 884326246.

It can be written as a sum of positive squares in 2 ways, for example, as 637461504 + 5161984 = 25248^2 + 2272^2 .

It is a super-2 number, since 2×642623488² = 825929894658572288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (642623483) 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, 14556 + ... + 38692.

Almost surely, 2^642623488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642623488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691915770).

642623488 is an abundant number, since it is smaller than the sum of its proper divisors (741208052).

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

642623488 is a wasteful number, since it uses less digits than its factorization.

642623488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24172 (or 24152 counting only the distinct ones).

The product of its digits is 442368, while the sum is 43.

The square root of 642623488 is about 25350.0194871720. The cubic root of 642623488 is about 862.9497985171.

The spelling of 642623488 in words is "six hundred forty-two million, six hundred twenty-three thousand, four hundred eighty-eight".