670926981 has 16 divisors (see below), whose sum is σ = 956962944. Its totient is φ = 416630784.

The previous prime is 670926973. The next prime is 670926989. The reversal of 670926981 is 189629076.

It is an interprime number because it is at equal distance from previous prime (670926973) and next prime (670926989).

It is not a de Polignac number, because 670926981 - 2³ = 670926973 is a prime.

It is a super-2 number, since 2×670926981² = 900286027667548722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 670926981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670926989) 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, 62865 + ... + 72758.

It is an arithmetic number, because the mean of its divisors is an integer number (59810184).

Almost surely, 2^670926981 is an apocalyptic number.

It is an amenable number.

670926981 is a deficient number, since it is larger than the sum of its proper divisors (286035963).

670926981 is a wasteful number, since it uses less digits than its factorization.

670926981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135740.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 670926981 is about 25902.2582220161. The cubic root of 670926981 is about 875.4373785051.

The spelling of 670926981 in words is "six hundred seventy million, nine hundred twenty-six thousand, nine hundred eighty-one".