78490859 has 4 divisors (see below), whose sum is σ = 79436616. Its totient is φ = 77545104.

The previous prime is 78490829. The next prime is 78490861. The reversal of 78490859 is 95809487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95809487 = 607 ⋅157841.

It is a cyclic number.

It is not a de Polignac number, because 78490859 - 2⁸ = 78490603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78490829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472754 + ... + 472919.

It is an arithmetic number, because the mean of its divisors is an integer number (19859154).

Almost surely, 2^78490859 is an apocalyptic number.

78490859 is a deficient number, since it is larger than the sum of its proper divisors (945757).

78490859 is an equidigital number, since it uses as much as digits as its factorization.

78490859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945756.

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 78490859 is about 8859.5067018429. The cubic root of 78490859 is about 428.1602651186.

The spelling of 78490859 in words is "seventy-eight million, four hundred ninety thousand, eight hundred fifty-nine".