7890561 has 32 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 4445712.

The previous prime is 7890557. The next prime is 7890563. The reversal of 7890561 is 1650987.

7890561 is a `hidden beast` number, since 7 + 8 + 90 + 561 = 666.

It is not a de Polignac number, because 7890561 - 2² = 7890557 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (7890563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15436 + ... + 15938.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^7890561 is an apocalyptic number.

It is an amenable number.

7890561 is a deficient number, since it is larger than the sum of its proper divisors (5656959).

7890561 is a wasteful number, since it uses less digits than its factorization.

7890561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 596 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 7890561 is about 2809.0142399069. The cubic root of 7890561 is about 199.0838177928.

The spelling of 7890561 in words is "seven million, eight hundred ninety thousand, five hundred sixty-one".