667422720 has 416 divisors, whose sum is σ = 2547728640. Its totient is φ = 165150720.

The previous prime is 667422673. The next prime is 667422739. The reversal of 667422720 is 27224766.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 9400285 + ... + 9400355.

Almost surely, 2^667422720 is an apocalyptic number.

667422720 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 667422720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1273864320).

667422720 is an abundant number, since it is smaller than the sum of its proper divisors (1880305920).

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

667422720 is a wasteful number, since it uses less digits than its factorization.

667422720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 98 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The square root of 667422720 is about 25834.5257359217. The cubic root of 667422720 is about 873.9105766878.

The spelling of 667422720 in words is "six hundred sixty-seven million, four hundred twenty-two thousand, seven hundred twenty".