667549872 has 60 divisors (see below), whose sum is σ = 2038054824. Its totient is φ = 202287360.

The previous prime is 667549871. The next prime is 667549919. The reversal of 667549872 is 278945766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667549871) 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 11 ways as a sum of consecutive naturals, for example, 209133 + ... + 212300.

Almost surely, 2^667549872 is an apocalyptic number.

It is an amenable number.

667549872 is an abundant number, since it is smaller than the sum of its proper divisors (1370504952).

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

667549872 is a wasteful number, since it uses less digits than its factorization.

667549872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421458 (or 421449 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The square root of 667549872 is about 25836.9865115884. The cubic root of 667549872 is about 873.9660699649.

The spelling of 667549872 in words is "six hundred sixty-seven million, five hundred forty-nine thousand, eight hundred seventy-two".