78490215 has 24 divisors (see below), whose sum is σ = 141090768. Its totient is φ = 41860800.

The previous prime is 78490199. The next prime is 78490219. The reversal of 78490215 is 51209487.

It is not a de Polignac number, because 78490215 - 2⁴ = 78490199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78490215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78490219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31086 + ... + 33515.

It is an arithmetic number, because the mean of its divisors is an integer number (5878782).

Almost surely, 2^78490215 is an apocalyptic number.

78490215 is a deficient number, since it is larger than the sum of its proper divisors (62600553).

78490215 is an equidigital number, since it uses as much as digits as its factorization.

78490215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64621 (or 64609 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 78490215 is about 8859.4703566297. The cubic root of 78490215 is about 428.1590941289.

The spelling of 78490215 in words is "seventy-eight million, four hundred ninety thousand, two hundred fifteen".