68820657 has 4 divisors (see below), whose sum is σ = 91760880. Its totient is φ = 45880436.

The previous prime is 68820617. The next prime is 68820701. The reversal of 68820657 is 75602886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68820657 - 2⁶ = 68820593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68820617) 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, 11470107 + ... + 11470112.

It is an arithmetic number, because the mean of its divisors is an integer number (22940220).

Almost surely, 2^68820657 is an apocalyptic number.

It is an amenable number.

68820657 is a deficient number, since it is larger than the sum of its proper divisors (22940223).

68820657 is a wasteful number, since it uses less digits than its factorization.

68820657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22940222.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 68820657 is about 8295.8216591245. The cubic root of 68820657 is about 409.8009285419.

The spelling of 68820657 in words is "sixty-eight million, eight hundred twenty thousand, six hundred fifty-seven".