670138428 has 12 divisors (see below), whose sum is σ = 1563656360. Its totient is φ = 223379472.

The previous prime is 670138423. The next prime is 670138429. The reversal of 670138428 is 824831076.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×670138428² = 898171025364622368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670138421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27922423 + ... + 27922446.

Almost surely, 2^670138428 is an apocalyptic number.

It is an amenable number.

670138428 is an abundant number, since it is smaller than the sum of its proper divisors (893517932).

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

670138428 is a wasteful number, since it uses less digits than its factorization.

670138428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55844876 (or 55844874 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 670138428 is about 25887.0320430906. The cubic root of 670138428 is about 875.0942714212.

The spelling of 670138428 in words is "six hundred seventy million, one hundred thirty-eight thousand, four hundred twenty-eight".