78127389 has 32 divisors (see below), whose sum is σ = 122115840. Its totient is φ = 49268736.

The previous prime is 78127369. The next prime is 78127391. The reversal of 78127389 is 98372187.

It is not a de Polignac number, because 78127389 - 2⁷ = 78127261 is a prime.

It is a super-2 number, since 2×78127389² = 12207777823914642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78127339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59589 + ... + 60885.

It is an arithmetic number, because the mean of its divisors is an integer number (3816120).

Almost surely, 2^78127389 is an apocalyptic number.

It is an amenable number.

78127389 is a deficient number, since it is larger than the sum of its proper divisors (43988451).

78127389 is a wasteful number, since it uses less digits than its factorization.

78127389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1426 (or 1420 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 78127389 is about 8838.9699060467. The cubic root of 78127389 is about 427.4983440995.

The spelling of 78127389 in words is "seventy-eight million, one hundred twenty-seven thousand, three hundred eighty-nine".