86626778 has 16 divisors (see below), whose sum is σ = 148686720. Its totient is φ = 37079856.

The previous prime is 86626777. The next prime is 86626783. The reversal of 86626778 is 87762668.

It is a happy number.

It is a super-2 number, since 2×86626778² = 15008397333322568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86626777) 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, 9500 + ... + 16232.

It is an arithmetic number, because the mean of its divisors is an integer number (9292920).

Almost surely, 2^86626778 is an apocalyptic number.

86626778 is a deficient number, since it is larger than the sum of its proper divisors (62059942).

86626778 is a wasteful number, since it uses less digits than its factorization.

86626778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7661.

The product of its digits is 1354752, while the sum is 50.

The square root of 86626778 is about 9307.3507508850. The cubic root of 86626778 is about 442.4702277095.

The spelling of 86626778 in words is "eighty-six million, six hundred twenty-six thousand, seven hundred seventy-eight".