667939392 has 224 divisors, whose sum is σ = 2087920640. Its totient is φ = 209018880.

The previous prime is 667939373. The next prime is 667939409. The reversal of 667939392 is 293939766.

It is a happy number.

It is a super-2 number, since 2×667939392² = 892286062770659328, which contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1981848 + ... + 1982184.

Almost surely, 2^667939392 is an apocalyptic number.

667939392 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667939392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1043960320).

667939392 is an abundant number, since it is smaller than the sum of its proper divisors (1419981248).

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

667939392 is a wasteful number, since it uses less digits than its factorization.

667939392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 410 counting only the distinct ones).

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

The square root of 667939392 is about 25844.5234430817. The cubic root of 667939392 is about 874.1360253422.

The spelling of 667939392 in words is "six hundred sixty-seven million, nine hundred thirty-nine thousand, three hundred ninety-two".