667923540 has 48 divisors (see below), whose sum is σ = 1980199872. Its totient is φ = 167635456.

The previous prime is 667923539. The next prime is 667923541. The reversal of 667923540 is 45329766.

It is an interprime number because it is at equal distance from previous prime (667923539) and next prime (667923541).

It is a super-2 number, since 2×667923540² = 892243710572263200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667923492 and 667923501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667923541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326394 + ... + 328433.

It is an arithmetic number, because the mean of its divisors is an integer number (41254164).

Almost surely, 2^667923540 is an apocalyptic number.

667923540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667923540 is an abundant number, since it is smaller than the sum of its proper divisors (1312276332).

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

667923540 is a wasteful number, since it uses less digits than its factorization.

667923540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654856 (or 654854 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 667923540 is about 25844.2167612021. The cubic root of 667923540 is about 874.1291100871.

The spelling of 667923540 in words is "six hundred sixty-seven million, nine hundred twenty-three thousand, five hundred forty".