56667840 has 56 divisors (see below), whose sum is σ = 179923440. Its totient is φ = 15111168.

The previous prime is 56667839. The next prime is 56667847. The reversal of 56667840 is 4876665.

It is a happy number.

It is a super-2 number, since 2×56667840² = 6422488180531200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56667792 and 56667801.

It is not an unprimeable number, because it can be changed into a prime (56667847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28555 + ... + 30474.

Almost surely, 2^56667840 is an apocalyptic number.

It is an amenable number.

56667840 is an abundant number, since it is smaller than the sum of its proper divisors (123255600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56667840 is a wasteful number, since it uses less digits than its factorization.

56667840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59049 (or 59039 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 56667840 is about 7527.8044607973. The cubic root of 56667840 is about 384.1011018512.

The spelling of 56667840 in words is "fifty-six million, six hundred sixty-seven thousand, eight hundred forty".