27970744647 has 16 divisors (see below), whose sum is σ = 38007595008. Its totient is φ = 18290706720.

The previous prime is 27970744643. The next prime is 27970744649. The reversal of 27970744647 is 74644707972.

It is a happy number.

It is not a de Polignac number, because 27970744647 - 2² = 27970744643 is a prime.

It is a super-2 number, since 2×27970744647² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27970744643) 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, 678138 + ... + 718200.

It is an arithmetic number, because the mean of its divisors is an integer number (2375474688).

Almost surely, 2^27970744647 is an apocalyptic number.

27970744647 is a deficient number, since it is larger than the sum of its proper divisors (10036850361).

27970744647 is a wasteful number, since it uses less digits than its factorization.

27970744647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44510.

The product of its (nonzero) digits is 16595712, while the sum is 57.

The spelling of 27970744647 in words is "twenty-seven billion, nine hundred seventy million, seven hundred forty-four thousand, six hundred forty-seven".