78578311 has 12 divisors (see below), whose sum is σ = 91785960. Its totient is φ = 67074000.

The previous prime is 78578293. The next prime is 78578317. The reversal of 78578311 is 11387587.

It is a happy number.

It is not a de Polignac number, because 78578311 - 2¹⁹ = 78054023 is a prime.

It is a super-2 number, since 2×78578311² = 12349101919225442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78578317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9105 + ... + 15493.

It is an arithmetic number, because the mean of its divisors is an integer number (7648830).

Almost surely, 2^78578311 is an apocalyptic number.

78578311 is a deficient number, since it is larger than the sum of its proper divisors (13207649).

78578311 is a wasteful number, since it uses less digits than its factorization.

78578311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6654 (or 6647 counting only the distinct ones).

The product of its digits is 47040, while the sum is 40.

The square root of 78578311 is about 8864.4408171074. The cubic root of 78578311 is about 428.3192202482.

The spelling of 78578311 in words is "seventy-eight million, five hundred seventy-eight thousand, three hundred eleven".