45551978 has 4 divisors (see below), whose sum is σ = 68327970. Its totient is φ = 22775988.

The previous prime is 45551969. The next prime is 45551981. The reversal of 45551978 is 87915554.

45551978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 36084049 + 9467929 = 6007^2 + 3077^2 .

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 as a sum of consecutive naturals, namely, 11387993 + ... + 11387996.

Almost surely, 2^45551978 is an apocalyptic number.

45551978 is a deficient number, since it is larger than the sum of its proper divisors (22775992).

45551978 is a wasteful number, since it uses less digits than its factorization.

45551978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22775991.

The product of its digits is 252000, while the sum is 44.

The square root of 45551978 is about 6749.2205475892. The cubic root of 45551978 is about 357.1377405286.

The spelling of 45551978 in words is "forty-five million, five hundred fifty-one thousand, nine hundred seventy-eight".