670836391 has 4 divisors (see below), whose sum is σ = 674714232. Its totient is φ = 666958552.

The previous prime is 670836389. The next prime is 670836409. The reversal of 670836391 is 193638076.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 670836391 - 2¹ = 670836389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670833391) 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, 1938661 + ... + 1939006.

It is an arithmetic number, because the mean of its divisors is an integer number (168678558).

Almost surely, 2^670836391 is an apocalyptic number.

670836391 is a deficient number, since it is larger than the sum of its proper divisors (3877841).

670836391 is a wasteful number, since it uses less digits than its factorization.

670836391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877840.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 670836391 is about 25900.5094737536. The cubic root of 670836391 is about 875.3979755875.

The spelling of 670836391 in words is "six hundred seventy million, eight hundred thirty-six thousand, three hundred ninety-one".