667998100 has 72 divisors (see below), whose sum is σ = 1807259328. Its totient is φ = 208204800.

The previous prime is 667998091. The next prime is 667998103. The reversal of 667998100 is 1899766.

It is a super-2 number, since 2×667998100² = 892442923207220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667998103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35677 + ... + 51076.

It is an arithmetic number, because the mean of its divisors is an integer number (25100824).

Almost surely, 2^667998100 is an apocalyptic number.

It is an amenable number.

667998100 is an abundant number, since it is smaller than the sum of its proper divisors (1139261228).

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

667998100 is a wasteful number, since it uses less digits than its factorization.

667998100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86785 (or 86778 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 667998100 is about 25845.6592100105. The cubic root of 667998100 is about 874.1616350881.

The spelling of 667998100 in words is "six hundred sixty-seven million, nine hundred ninety-eight thousand, one hundred".