27970813 has 8 divisors (see below), whose sum is σ = 30298968. Its totient is φ = 25667904.

The previous prime is 27970807. The next prime is 27970841. The reversal of 27970813 is 31807972.

It can be written as a sum of positive squares in 4 ways, for example, as 544644 + 27426169 = 738^2 + 5237^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27970813 - 2⁹ = 27970301 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 (27970883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3970 + ... + 8467.

It is an arithmetic number, because the mean of its divisors is an integer number (3787371).

Almost surely, 2^27970813 is an apocalyptic number.

It is an amenable number.

27970813 is a deficient number, since it is larger than the sum of its proper divisors (2328155).

27970813 is a wasteful number, since it uses less digits than its factorization.

27970813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12623.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 27970813 is about 5288.7439907789. The cubic root of 27970813 is about 303.5533498833.

The spelling of 27970813 in words is "twenty-seven million, nine hundred seventy thousand, eight hundred thirteen".