667765056 has 56 divisors (see below), whose sum is σ = 2019198400. Its totient is φ = 190789632.

The previous prime is 667764971. The next prime is 667765057. The reversal of 667765056 is 650567766.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 667764996 and 667765014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667765057) 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 7 ways as a sum of consecutive naturals, for example, 247081 + ... + 249768.

Almost surely, 2^667765056 is an apocalyptic number.

It is an amenable number.

667765056 is an abundant number, since it is smaller than the sum of its proper divisors (1351433344).

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

667765056 is a wasteful number, since it uses less digits than its factorization.

667765056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 496871 (or 496861 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 48.

The square root of 667765056 is about 25841.1504387866. The cubic root of 667765056 is about 874.0599672246.

The spelling of 667765056 in words is "six hundred sixty-seven million, seven hundred sixty-five thousand, fifty-six".