38561690 has 16 divisors (see below), whose sum is σ = 69505992. Its totient is φ = 15403584.

The previous prime is 38561683. The next prime is 38561701. The reversal of 38561690 is 9616583.

38561690 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 4 ways, for example, as 35509681 + 3052009 = 5959^2 + 1747^2 .

It is a super-2 number, since 2×38561690² = 2974007871312200, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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 in 7 ways as a sum of consecutive naturals, for example, 6572 + ... + 10968.

Almost surely, 2^38561690 is an apocalyptic number.

38561690 is a deficient number, since it is larger than the sum of its proper divisors (30944302).

38561690 is a wasteful number, since it uses less digits than its factorization.

38561690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 38561690 is about 6209.8059551004. The cubic root of 38561690 is about 337.8459260662.

The spelling of 38561690 in words is "thirty-eight million, five hundred sixty-one thousand, six hundred ninety".