78942487 has 8 divisors (see below), whose sum is σ = 85796480. Its totient is φ = 72200160.

The previous prime is 78942467. The next prime is 78942499. The reversal of 78942487 is 78424987.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78942487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78942487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78942467) 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, 26439 + ... + 29272.

It is an arithmetic number, because the mean of its divisors is an integer number (10724560).

Almost surely, 2^78942487 is an apocalyptic number.

78942487 is a deficient number, since it is larger than the sum of its proper divisors (6853993).

78942487 is a wasteful number, since it uses less digits than its factorization.

78942487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55833.

The product of its digits is 903168, while the sum is 49.

The square root of 78942487 is about 8884.9584692333. The cubic root of 78942487 is about 428.9798912192.

The spelling of 78942487 in words is "seventy-eight million, nine hundred forty-two thousand, four hundred eighty-seven".