667421700 has 144 divisors (see below), whose sum is σ = 2230732224. Its totient is φ = 152268800.

The previous prime is 667421687. The next prime is 667421719. The reversal of 667421700 is 7124766.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50152 + ... + 62048.

It is an arithmetic number, because the mean of its divisors is an integer number (15491196).

Almost surely, 2^667421700 is an apocalyptic number.

667421700 is a gapful number since it is divisible by the number (60) 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 667421700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1115366112).

667421700 is an abundant number, since it is smaller than the sum of its proper divisors (1563310524).

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

667421700 is a wasteful number, since it uses less digits than its factorization.

667421700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11942 (or 11935 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 33.

The square root of 667421700 is about 25834.5059948899. The cubic root of 667421700 is about 873.9101314980.

The spelling of 667421700 in words is "six hundred sixty-seven million, four hundred twenty-one thousand, seven hundred".