667474128 has 80 divisors (see below), whose sum is σ = 2028620160. Its totient is φ = 209401344.

The previous prime is 667474127. The next prime is 667474153. The reversal of 667474128 is 821474766.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667474127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38100 + ... + 52787.

It is an arithmetic number, because the mean of its divisors is an integer number (25357752).

Almost surely, 2^667474128 is an apocalyptic number.

667474128 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

667474128 is an abundant number, since it is smaller than the sum of its proper divisors (1361146032).

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

667474128 is a wasteful number, since it uses less digits than its factorization.

667474128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90921 (or 90909 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 667474128 is about 25835.5206643876. The cubic root of 667474128 is about 873.9330136632.

The spelling of 667474128 in words is "six hundred sixty-seven million, four hundred seventy-four thousand, one hundred twenty-eight".