670788864 has 216 divisors, whose sum is σ = 2062412352. Its totient is φ = 217313280.

The previous prime is 670788809. The next prime is 670788871. The reversal of 670788864 is 468887076.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 670788864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2550397 + ... + 2550659.

Almost surely, 2^670788864 is an apocalyptic number.

670788864 is a gapful number since it is divisible by the number (64) 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 670788864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031206176).

670788864 is an abundant number, since it is smaller than the sum of its proper divisors (1391623488).

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

670788864 is an equidigital number, since it uses as much as digits as its factorization.

670788864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The square root of 670788864 is about 25899.5919658978. The cubic root of 670788864 is about 875.3773018819.

The spelling of 670788864 in words is "six hundred seventy million, seven hundred eighty-eight thousand, eight hundred sixty-four".