642520502 has 32 divisors (see below), whose sum is σ = 1101461760. Its totient is φ = 278831520.

The previous prime is 642520499. The next prime is 642520507. The reversal of 642520502 is 205025246.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642520507) 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, 26177 + ... + 44387.

It is an arithmetic number, because the mean of its divisors is an integer number (34420680).

Almost surely, 2^642520502 is an apocalyptic number.

642520502 is a deficient number, since it is larger than the sum of its proper divisors (458941258).

642520502 is a wasteful number, since it uses less digits than its factorization.

642520502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18308.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 642520502 is about 25347.9881252931. The cubic root of 642520502 is about 862.9036976522.

Adding to 642520502 its reverse (205025246), we get a palindrome (847545748).

The spelling of 642520502 in words is "six hundred forty-two million, five hundred twenty thousand, five hundred two".