78556487 has 4 divisors (see below), whose sum is σ = 79334376. Its totient is φ = 77778600.

The previous prime is 78556483. The next prime is 78556493. The reversal of 78556487 is 78465587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78465587 = 101 ⋅776887.

It is a cyclic number.

It is not a de Polignac number, because 78556487 - 2² = 78556483 is a prime.

It is a super-2 number, since 2×78556487² = 12342243299562338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78556481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388793 + ... + 388994.

It is an arithmetic number, because the mean of its divisors is an integer number (19833594).

Almost surely, 2^78556487 is an apocalyptic number.

78556487 is a deficient number, since it is larger than the sum of its proper divisors (777889).

78556487 is a wasteful number, since it uses less digits than its factorization.

78556487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777888.

The product of its digits is 1881600, while the sum is 50.

The square root of 78556487 is about 8863.2097459103. The cubic root of 78556487 is about 428.2795634012.

The spelling of 78556487 in words is "seventy-eight million, five hundred fifty-six thousand, four hundred eighty-seven".