68515638 has 32 divisors (see below), whose sum is σ = 143147520. Its totient is φ = 21840480.

The previous prime is 68515621. The next prime is 68515679. The reversal of 68515638 is 83651586.

It is a self number, because there is not a number n which added to its sum of digits gives 68515638.

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, 10483 + ... + 15713.

It is an arithmetic number, because the mean of its divisors is an integer number (4473360).

Almost surely, 2^68515638 is an apocalyptic number.

68515638 is an abundant number, since it is smaller than the sum of its proper divisors (74631882).

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

68515638 is a wasteful number, since it uses less digits than its factorization.

68515638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332.

The product of its digits is 172800, while the sum is 42.

The square root of 68515638 is about 8277.4173508408. The cubic root of 68515638 is about 409.1946077229.

The spelling of 68515638 in words is "sixty-eight million, five hundred fifteen thousand, six hundred thirty-eight".