670400838 has 48 divisors (see below), whose sum is σ = 1471841280. Its totient is φ = 220513392.

The previous prime is 670400827. The next prime is 670400897. The reversal of 670400838 is 838004076.

670400838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×670400838² = 898874567182204488, which contains 22 as substring.

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, 776395 + ... + 777257.

It is an arithmetic number, because the mean of its divisors is an integer number (30663360).

Almost surely, 2^670400838 is an apocalyptic number.

670400838 is an abundant number, since it is smaller than the sum of its proper divisors (801440442).

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

670400838 is a wasteful number, since it uses less digits than its factorization.

670400838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393 (or 1390 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 670400838 is about 25892.0999148389. The cubic root of 670400838 is about 875.2084784326.

The spelling of 670400838 in words is "six hundred seventy million, four hundred thousand, eight hundred thirty-eight".