42788890 has 16 divisors (see below), whose sum is σ = 77254632. Its totient is φ = 17063424.

The previous prime is 42788873. The next prime is 42788899. The reversal of 42788890 is 9888724.

It can be written as a sum of positive squares in 4 ways, for example, as 23261329 + 19527561 = 4823^2 + 4419^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42788890.

It is not an unprimeable number, because it can be changed into a prime (42788899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2979 + ... + 9718.

Almost surely, 2^42788890 is an apocalyptic number.

42788890 is a deficient number, since it is larger than the sum of its proper divisors (34465742).

42788890 is a wasteful number, since it uses less digits than its factorization.

42788890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13041.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 42788890 is about 6541.3217318826. The cubic root of 42788890 is about 349.7655300351.

The spelling of 42788890 in words is "forty-two million, seven hundred eighty-eight thousand, eight hundred ninety".