78731487 has 8 divisors (see below), whose sum is σ = 116639280. Its totient is φ = 52487640.

The previous prime is 78731483. The next prime is 78731501. The reversal of 78731487 is 78413787.

It is a happy number.

It is not a de Polignac number, because 78731487 - 2² = 78731483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78731483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1457964 + ... + 1458017.

It is an arithmetic number, because the mean of its divisors is an integer number (14579910).

Almost surely, 2^78731487 is an apocalyptic number.

78731487 is a deficient number, since it is larger than the sum of its proper divisors (37907793).

78731487 is a wasteful number, since it uses less digits than its factorization.

78731487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2915990 (or 2915984 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 78731487 is about 8873.0765239572. The cubic root of 78731487 is about 428.5973531461.

The spelling of 78731487 in words is "seventy-eight million, seven hundred thirty-one thousand, four hundred eighty-seven".