45388778 has 4 divisors (see below), whose sum is σ = 68083170. Its totient is φ = 22694388.

The previous prime is 45388771. The next prime is 45388781. The reversal of 45388778 is 87788354.

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., 28058209 + 17330569 = 5297^2 + 4163^2 .

It is not an unprimeable number, because it can be changed into a prime (45388771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11347193 + ... + 11347196.

Almost surely, 2^45388778 is an apocalyptic number.

45388778 is a deficient number, since it is larger than the sum of its proper divisors (22694392).

45388778 is a wasteful number, since it uses less digits than its factorization.

45388778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22694391.

The product of its digits is 1505280, while the sum is 50.

The square root of 45388778 is about 6737.1194141116. The cubic root of 45388778 is about 356.7107219385.

The spelling of 45388778 in words is "forty-five million, three hundred eighty-eight thousand, seven hundred seventy-eight".