68643507 has 4 divisors (see below), whose sum is σ = 91524680. Its totient is φ = 45762336.

The previous prime is 68643503. The next prime is 68643521. The reversal of 68643507 is 70534686.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68643507 - 2² = 68643503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68643503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11440582 + ... + 11440587.

It is an arithmetic number, because the mean of its divisors is an integer number (22881170).

Almost surely, 2^68643507 is an apocalyptic number.

68643507 is a deficient number, since it is larger than the sum of its proper divisors (22881173).

68643507 is a wasteful number, since it uses less digits than its factorization.

68643507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22881172.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 68643507 is about 8285.1377176243. The cubic root of 68643507 is about 409.4490060405.

The spelling of 68643507 in words is "sixty-eight million, six hundred forty-three thousand, five hundred seven".