78422487 has 16 divisors (see below), whose sum is σ = 122844288. Its totient is φ = 43872480.

The previous prime is 78422453. The next prime is 78422489.

78422487 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78422487 - 2⁶ = 78422423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78422489) 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, 90973 + ... + 91830.

It is an arithmetic number, because the mean of its divisors is an integer number (7677768).

Almost surely, 2^78422487 is an apocalyptic number.

78422487 is a deficient number, since it is larger than the sum of its proper divisors (44421801).

78422487 is a wasteful number, since it uses less digits than its factorization.

78422487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182830.

The product of its digits is 200704, while the sum is 42.

The square root of 78422487 is about 8855.6471813188. The cubic root of 78422487 is about 428.0359080567.

The spelling of 78422487 in words is "seventy-eight million, four hundred twenty-two thousand, four hundred eighty-seven".