78929489 has 4 divisors (see below), whose sum is σ = 79277424. Its totient is φ = 78581556.

The previous prime is 78929479. The next prime is 78929507. The reversal of 78929489 is 98492987.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98492987 = 73 ⋅1349219.

It is a cyclic number.

It is not a de Polignac number, because 78929489 - 2⁸ = 78929233 is a prime.

It is a super-2 number, since 2×78929489² = 12459728467602242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78929479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173627 + ... + 174080.

It is an arithmetic number, because the mean of its divisors is an integer number (19819356).

Almost surely, 2^78929489 is an apocalyptic number.

It is an amenable number.

78929489 is a deficient number, since it is larger than the sum of its proper divisors (347935).

78929489 is a wasteful number, since it uses less digits than its factorization.

78929489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347934.

The product of its digits is 2612736, while the sum is 56.

The square root of 78929489 is about 8884.2269781901. The cubic root of 78929489 is about 428.9563458640.

The spelling of 78929489 in words is "seventy-eight million, nine hundred twenty-nine thousand, four hundred eighty-nine".