667072420 has 48 divisors (see below), whose sum is σ = 1608042240. Its totient is φ = 227700864.

The previous prime is 667072361. The next prime is 667072421. The reversal of 667072420 is 24270766.

667072420 = 116² + 117² + ... + 1260².

It is a super-2 number, since 2×667072420² = 889971227049312800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667072421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21657 + ... + 42463.

It is an arithmetic number, because the mean of its divisors is an integer number (33500880).

Almost surely, 2^667072420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 667072420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804021120).

667072420 is an abundant number, since it is smaller than the sum of its proper divisors (940969820).

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

667072420 is a wasteful number, since it uses less digits than its factorization.

667072420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21052 (or 21050 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 667072420 is about 25827.7451590339. The cubic root of 667072420 is about 873.7576578856.

The spelling of 667072420 in words is "six hundred sixty-seven million, seventy-two thousand, four hundred twenty".