80990605 has 16 divisors (see below), whose sum is σ = 99046080. Its totient is φ = 63562752.

The previous prime is 80990593. The next prime is 80990617. The reversal of 80990605 is 50609908.

It is an interprime number because it is at equal distance from previous prime (80990593) and next prime (80990617).

It is a cyclic number.

It is not a de Polignac number, because 80990605 - 2⁵ = 80990573 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140077 + ... + 140653.

It is an arithmetic number, because the mean of its divisors is an integer number (6190380).

Almost surely, 2^80990605 is an apocalyptic number.

It is an amenable number.

80990605 is a deficient number, since it is larger than the sum of its proper divisors (18055475).

80990605 is a wasteful number, since it uses less digits than its factorization.

80990605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 80990605 is about 8999.4780404199. The cubic root of 80990605 is about 432.6581421310.

The spelling of 80990605 in words is "eighty million, nine hundred ninety thousand, six hundred five".