40707778 has 4 divisors (see below), whose sum is σ = 61061670. Its totient is φ = 20353888.

The previous prime is 40707773. The next prime is 40707791. The reversal of 40707778 is 87770704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 35676729 + 5031049 = 5973^2 + 2243^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40707778.

It is not an unprimeable number, because it can be changed into a prime (40707773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10176943 + ... + 10176946.

Almost surely, 2^40707778 is an apocalyptic number.

40707778 is a deficient number, since it is larger than the sum of its proper divisors (20353892).

40707778 is a wasteful number, since it uses less digits than its factorization.

40707778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20353891.

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 40707778 is about 6380.2647280501. The cubic root of 40707778 is about 344.0005464657. Note that the first 3 decimals are identical.

The spelling of 40707778 in words is "forty million, seven hundred seven thousand, seven hundred seventy-eight".