45142778 has 4 divisors (see below), whose sum is σ = 67714170. Its totient is φ = 22571388.

The previous prime is 45142777. The next prime is 45142781. The reversal of 45142778 is 87724154.

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., 44448889 + 693889 = 6667^2 + 833^2 .

It is not an unprimeable number, because it can be changed into a prime (45142777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11285693 + ... + 11285696.

Almost surely, 2^45142778 is an apocalyptic number.

45142778 is a deficient number, since it is larger than the sum of its proper divisors (22571392).

45142778 is a wasteful number, since it uses less digits than its factorization.

45142778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22571391.

The product of its digits is 62720, while the sum is 38.

The square root of 45142778 is about 6718.8375482668. The cubic root of 45142778 is about 356.0651155982.

The spelling of 45142778 in words is "forty-five million, one hundred forty-two thousand, seven hundred seventy-eight".