45478138 has 4 divisors (see below), whose sum is σ = 68217210. Its totient is φ = 22739068.

The previous prime is 45478129. The next prime is 45478163. The reversal of 45478138 is 83187454.

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., 24930049 + 20548089 = 4993^2 + 4533^2 .

It is a super-2 number, since 2×45478138² = 4136522071894088, which contains 22 as substring.

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 45478138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11369533 + ... + 11369536.

Almost surely, 2^45478138 is an apocalyptic number.

45478138 is a deficient number, since it is larger than the sum of its proper divisors (22739072).

45478138 is a wasteful number, since it uses less digits than its factorization.

45478138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22739071.

The product of its digits is 107520, while the sum is 40.

The square root of 45478138 is about 6743.7480676550. The cubic root of 45478138 is about 356.9446621013.

The spelling of 45478138 in words is "forty-five million, four hundred seventy-eight thousand, one hundred thirty-eight".