78975381 has 16 divisors (see below), whose sum is σ = 114667200. Its totient is φ = 48158208.

The previous prime is 78975373. The next prime is 78975397. The reversal of 78975381 is 18357987.

It is not a de Polignac number, because 78975381 - 2³ = 78975373 is a prime.

It is a super-2 number, since 2×78975381² = 12474221608190322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78975381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78975301) 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, 22236 + ... + 25541.

It is an arithmetic number, because the mean of its divisors is an integer number (7166700).

Almost surely, 2^78975381 is an apocalyptic number.

It is an amenable number.

78975381 is a deficient number, since it is larger than the sum of its proper divisors (35691819).

78975381 is a wasteful number, since it uses less digits than its factorization.

78975381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47828.

The product of its digits is 423360, while the sum is 48.

The square root of 78975381 is about 8886.8093824499. The cubic root of 78975381 is about 429.0394658353.

The spelling of 78975381 in words is "seventy-eight million, nine hundred seventy-five thousand, three hundred eighty-one".