86401778 has 16 divisors (see below), whose sum is σ = 138297120. Its totient is φ = 40365216.

The previous prime is 86401753. The next prime is 86401781. The reversal of 86401778 is 87710468.

It is a super-2 number, since 2×86401778² = 14930534483122568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12800 + ... + 18347.

It is an arithmetic number, because the mean of its divisors is an integer number (8643570).

Almost surely, 2^86401778 is an apocalyptic number.

86401778 is a deficient number, since it is larger than the sum of its proper divisors (51895342).

86401778 is a wasteful number, since it uses less digits than its factorization.

86401778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31241.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 86401778 is about 9295.2556715778. The cubic root of 86401778 is about 442.0868123198.

The spelling of 86401778 in words is "eighty-six million, four hundred one thousand, seven hundred seventy-eight".