642562308 has 60 divisors (see below), whose sum is σ = 1689219532. Its totient is φ = 212984640.

The previous prime is 642562223. The next prime is 642562331. The reversal of 642562308 is 803265246.

642562308 is a `hidden beast` number, since 6 + 4 + 25 + 623 + 0 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 151585344 + 490976964 = 12312^2 + 22158^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 53166 + ... + 64122.

Almost surely, 2^642562308 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 642562308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844609766).

642562308 is an abundant number, since it is smaller than the sum of its proper divisors (1046657224).

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

642562308 is a wasteful number, since it uses less digits than its factorization.

642562308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11154 (or 11143 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 642562308 is about 25348.8127532632. The cubic root of 642562308 is about 862.9224123700.

It can be divided in two parts, 64256 and 2308, that added together give a square (66564 = 258²).

The spelling of 642562308 in words is "six hundred forty-two million, five hundred sixty-two thousand, three hundred eight".