68640147 has 12 divisors (see below), whose sum is σ = 99219120. Its totient is φ = 45726768.

The previous prime is 68640133. The next prime is 68640149. The reversal of 68640147 is 74104686.

68640147 is a `hidden beast` number, since 6 + 8 + 640 + 1 + 4 + 7 = 666.

It is not a de Polignac number, because 68640147 - 2⁸ = 68639891 is a prime.

It is a super-2 number, since 2×68640147² = 9422939560363218, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68640149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20754 + ... + 23832.

It is an arithmetic number, because the mean of its divisors is an integer number (8268260).

Almost surely, 2^68640147 is an apocalyptic number.

68640147 is a deficient number, since it is larger than the sum of its proper divisors (30578973).

68640147 is a wasteful number, since it uses less digits than its factorization.

68640147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562 (or 5559 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 68640147 is about 8284.9349424120. The cubic root of 68640147 is about 409.4423252867.

The spelling of 68640147 in words is "sixty-eight million, six hundred forty thousand, one hundred forty-seven".