642617448 has 64 divisors (see below), whose sum is σ = 1767165120. Its totient is φ = 194722880.

The previous prime is 642617431. The next prime is 642617453. The reversal of 642617448 is 844716246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21886 + ... + 42002.

It is an arithmetic number, because the mean of its divisors is an integer number (27611955).

Almost surely, 2^642617448 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 642617448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (883582560).

642617448 is an abundant number, since it is smaller than the sum of its proper divisors (1124547672).

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

642617448 is a wasteful number, since it uses less digits than its factorization.

642617448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20159 (or 20133 counting only the distinct ones).

The product of its digits is 258048, while the sum is 42.

The square root of 642617448 is about 25349.9003548337. The cubic root of 642617448 is about 862.9470948950.

The spelling of 642617448 in words is "six hundred forty-two million, six hundred seventeen thousand, four hundred forty-eight".