667339992 has 128 divisors (see below), whose sum is σ = 2077171200. Its totient is φ = 196732800.

The previous prime is 667339991. The next prime is 667339997. The reversal of 667339992 is 299933766.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667339991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84117 + ... + 91707.

It is an arithmetic number, because the mean of its divisors is an integer number (16227900).

Almost surely, 2^667339992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667339992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1038585600).

667339992 is an abundant number, since it is smaller than the sum of its proper divisors (1409831208).

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

667339992 is a wasteful number, since it uses less digits than its factorization.

667339992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654 (or 7644 counting only the distinct ones).

The product of its digits is 3306744, while the sum is 54.

The square root of 667339992 is about 25832.9245731102. The cubic root of 667339992 is about 873.8744677075.

It can be divided in two parts, 6673 and 39992, that added together give a triangular number (46665 = T₃₀₅).

The spelling of 667339992 in words is "six hundred sixty-seven million, three hundred thirty-nine thousand, nine hundred ninety-two".