45540778 has 4 divisors (see below), whose sum is σ = 68311170. Its totient is φ = 22770388.

The previous prime is 45540769. The next prime is 45540779. The reversal of 45540778 is 87704554.

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., 45522009 + 18769 = 6747^2 + 137^2 .

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 45540778.

It is not an unprimeable number, because it can be changed into a prime (45540779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11385193 + ... + 11385196.

Almost surely, 2^45540778 is an apocalyptic number.

45540778 is a deficient number, since it is larger than the sum of its proper divisors (22770392).

45540778 is a wasteful number, since it uses less digits than its factorization.

45540778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22770391.

The product of its (nonzero) digits is 156800, while the sum is 40.

The square root of 45540778 is about 6748.3907711394. The cubic root of 45540778 is about 357.1084679574.

The spelling of 45540778 in words is "forty-five million, five hundred forty thousand, seven hundred seventy-eight".