78362489 has 4 divisors (see below), whose sum is σ = 80029824. Its totient is φ = 76695156.

The previous prime is 78362447. The next prime is 78362509. The reversal of 78362489 is 98426387.

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.

It is a cyclic number.

It is not a de Polignac number, because 78362489 - 2²⁴ = 61585273 is a prime.

It is a super-2 number, since 2×78362489² = 12281359364550242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1667287 = 78362489 / (7 + 8 + 3 + 6 + 2 + 4 + 8 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78362689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 833597 + ... + 833690.

It is an arithmetic number, because the mean of its divisors is an integer number (20007456).

Almost surely, 2^78362489 is an apocalyptic number.

It is an amenable number.

78362489 is a deficient number, since it is larger than the sum of its proper divisors (1667335).

78362489 is a wasteful number, since it uses less digits than its factorization.

78362489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667334.

The product of its digits is 580608, while the sum is 47.

The square root of 78362489 is about 8852.2589772329. The cubic root of 78362489 is about 427.9267223226.

The spelling of 78362489 in words is "seventy-eight million, three hundred sixty-two thousand, four hundred eighty-nine".