68732639 has 8 divisors (see below), whose sum is σ = 72078960. Its totient is φ = 65451456.

The previous prime is 68732623. The next prime is 68732647. The reversal of 68732639 is 93623786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68732639 - 2⁴ = 68732623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68732639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68732669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14117 + ... + 18350.

It is an arithmetic number, because the mean of its divisors is an integer number (9009870).

Almost surely, 2^68732639 is an apocalyptic number.

68732639 is a deficient number, since it is larger than the sum of its proper divisors (3346321).

68732639 is a wasteful number, since it uses less digits than its factorization.

68732639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32569.

The product of its digits is 326592, while the sum is 44.

The square root of 68732639 is about 8290.5150020973. The cubic root of 68732639 is about 409.6261493996.

The spelling of 68732639 in words is "sixty-eight million, seven hundred thirty-two thousand, six hundred thirty-nine".