78957987 has 8 divisors (see below), whose sum is σ = 105319104. Its totient is φ = 52617768.

The previous prime is 78957943. The next prime is 78958031. The reversal of 78957987 is 78975987.

It is an interprime number because it is at equal distance from previous prime (78957943) and next prime (78958031).

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

It is not a de Polignac number, because 78957987 - 2¹⁰ = 78956963 is a prime.

It is a super-2 number, since 2×78957987² = 12468727422184338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78957987.

It is not an unprimeable number, because it can be changed into a prime (78957917) 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, 9628 + ... + 15830.

It is an arithmetic number, because the mean of its divisors is an integer number (13164888).

Almost surely, 2^78957987 is an apocalyptic number.

78957987 is a deficient number, since it is larger than the sum of its proper divisors (26361117).

78957987 is a wasteful number, since it uses less digits than its factorization.

78957987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449.

The product of its digits is 8890560, while the sum is 60.

The square root of 78957987 is about 8885.8306871108. The cubic root of 78957987 is about 429.0079654685.

The spelling of 78957987 in words is "seventy-eight million, nine hundred fifty-seven thousand, nine hundred eighty-seven".