78081585 has 16 divisors (see below), whose sum is σ = 126169920. Its totient is φ = 41230400.

The previous prime is 78081559. The next prime is 78081587. The reversal of 78081585 is 58518087.

It is a de Polignac number, because none of the positive numbers 2^k-78081585 is a prime.

It is a super-2 number, since 2×78081585² = 12193467832224450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78081587) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24255 + ... + 27284.

It is an arithmetic number, because the mean of its divisors is an integer number (7885620).

Almost surely, 2^78081585 is an apocalyptic number.

It is an amenable number.

78081585 is a deficient number, since it is larger than the sum of its proper divisors (48088335).

78081585 is a wasteful number, since it uses less digits than its factorization.

78081585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51648.

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 78081585 is about 8836.3785002681. The cubic root of 78081585 is about 427.4147841500.

The spelling of 78081585 in words is "seventy-eight million, eighty-one thousand, five hundred eighty-five".