56667766 has 16 divisors (see below), whose sum is σ = 94739760. Its totient is φ = 25263360.

The previous prime is 56667763. The next prime is 56667773. The reversal of 56667766 is 66776665.

56667766 = 1029² + 1030² + ... + 1079².

It is a super-2 number, since 2×56667766² = 6422471406861512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56667763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43215 + ... + 44506.

It is an arithmetic number, because the mean of its divisors is an integer number (5921235).

Almost surely, 2^56667766 is an apocalyptic number.

56667766 is a deficient number, since it is larger than the sum of its proper divisors (38071994).

56667766 is a wasteful number, since it uses less digits than its factorization.

56667766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87759.

The product of its digits is 1905120, while the sum is 49.

The square root of 56667766 is about 7527.7995456840. The cubic root of 56667766 is about 384.1009346576.

The spelling of 56667766 in words is "fifty-six million, six hundred sixty-seven thousand, seven hundred sixty-six".