40168778 has 16 divisors (see below), whose sum is σ = 65859360. Its totient is φ = 18261936.

The previous prime is 40168759. The next prime is 40168781. The reversal of 40168778 is 87786104.

40168778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40168778² = 3227061452026568, 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, 9788 + ... + 13271.

It is an arithmetic number, because the mean of its divisors is an integer number (4116210).

Almost surely, 2^40168778 is an apocalyptic number.

40168778 is a deficient number, since it is larger than the sum of its proper divisors (25690582).

40168778 is a wasteful number, since it uses less digits than its factorization.

40168778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23141.

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

The square root of 40168778 is about 6337.8843473197. The cubic root of 40168778 is about 342.4755249174.

The spelling of 40168778 in words is "forty million, one hundred sixty-eight thousand, seven hundred seventy-eight".