642662472 has 64 divisors (see below), whose sum is σ = 1671148800. Its totient is φ = 205770240.

The previous prime is 642662467. The next prime is 642662473. The reversal of 642662472 is 274266246.

It is a self number, because there is not a number n which added to its sum of digits gives 642662472.

It is not an unprimeable number, because it can be changed into a prime (642662473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65572 + ... + 74732.

It is an arithmetic number, because the mean of its divisors is an integer number (26111700).

Almost surely, 2^642662472 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 642662472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (835574400).

642662472 is an abundant number, since it is smaller than the sum of its proper divisors (1028486328).

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

642662472 is a wasteful number, since it uses less digits than its factorization.

642662472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9286 (or 9282 counting only the distinct ones).

The product of its digits is 193536, while the sum is 39.

The square root of 642662472 is about 25350.7883901073. The cubic root of 642662472 is about 862.9672481100.

The spelling of 642662472 in words is "six hundred forty-two million, six hundred sixty-two thousand, four hundred seventy-two".