68400593 has 4 divisors (see below), whose sum is σ = 68576820. Its totient is φ = 68224368.

The previous prime is 68400583. The next prime is 68400599. The reversal of 68400593 is 39500486.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4592449 + 63808144 = 2143^2 + 7988^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68400593 is a prime.

It is a super-2 number, since 2×68400593² = 9357282245503298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68400599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87530 + ... + 88307.

It is an arithmetic number, because the mean of its divisors is an integer number (17144205).

Almost surely, 2^68400593 is an apocalyptic number.

It is an amenable number.

68400593 is a deficient number, since it is larger than the sum of its proper divisors (176227).

68400593 is a wasteful number, since it uses less digits than its factorization.

68400593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176226.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 68400593 is about 8270.4651017945. The cubic root of 68400593 is about 408.9654524135.

The spelling of 68400593 in words is "sixty-eight million, four hundred thousand, five hundred ninety-three".