67856457 has 4 divisors (see below), whose sum is σ = 90475280. Its totient is φ = 45237636.

The previous prime is 67856449. The next prime is 67856473. The reversal of 67856457 is 75465876.

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 not a de Polignac number, because 67856457 - 2³ = 67856449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67856407) 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, 11309407 + ... + 11309412.

It is an arithmetic number, because the mean of its divisors is an integer number (22618820).

Almost surely, 2^67856457 is an apocalyptic number.

It is an amenable number.

67856457 is a deficient number, since it is larger than the sum of its proper divisors (22618823).

67856457 is a wasteful number, since it uses less digits than its factorization.

67856457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22618822.

The product of its digits is 1411200, while the sum is 48.

The square root of 67856457 is about 8237.5030804243. The cubic root of 67856457 is about 407.8781054067.

The spelling of 67856457 in words is "sixty-seven million, eight hundred fifty-six thousand, four hundred fifty-seven".