78722487 has 12 divisors (see below), whose sum is σ = 113819784. Its totient is φ = 52431120.

The previous prime is 78722471. The next prime is 78722507. The reversal of 78722487 is 78422787.

It is not a de Polignac number, because 78722487 - 2⁴ = 78722471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78722407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7312 + ... + 14522.

It is an arithmetic number, because the mean of its divisors is an integer number (9484982).

Almost surely, 2^78722487 is an apocalyptic number.

78722487 is a deficient number, since it is larger than the sum of its proper divisors (35097297).

78722487 is a wasteful number, since it uses less digits than its factorization.

78722487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8430 (or 8427 counting only the distinct ones).

The product of its digits is 351232, while the sum is 45.

The square root of 78722487 is about 8872.5693572944. The cubic root of 78722487 is about 428.5810211662.

The spelling of 78722487 in words is "seventy-eight million, seven hundred twenty-two thousand, four hundred eighty-seven".