42974728 has 8 divisors (see below), whose sum is σ = 80577630. Its totient is φ = 21487360.

The previous prime is 42974719. The next prime is 42974747. The reversal of 42974728 is 82747924.

42974728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 42536484 + 438244 = 6522^2 + 662^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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, 2685913 + ... + 2685928.

Almost surely, 2^42974728 is an apocalyptic number.

It is an amenable number.

42974728 is a deficient number, since it is larger than the sum of its proper divisors (37602902).

42974728 is a wasteful number, since it uses less digits than its factorization.

42974728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371847 (or 5371843 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 42974728 is about 6555.5112691536. The cubic root of 42974728 is about 350.2711585762.

It can be divided in two parts, 4297 and 4728, that added together give a square (9025 = 95²).

The spelling of 42974728 in words is "forty-two million, nine hundred seventy-four thousand, seven hundred twenty-eight".