80905810 has 8 divisors (see below), whose sum is σ = 145630476. Its totient is φ = 32362320.

The previous prime is 80905807. The next prime is 80905813. The reversal of 80905810 is 1850908.

It is an interprime number because it is at equal distance from previous prime (80905807) and next prime (80905813).

It can be written as a sum of positive squares in 2 ways, for example, as 78694641 + 2211169 = 8871^2 + 1487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×80905810² = 13091500183512200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80905813) 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 3 ways as a sum of consecutive naturals, for example, 4045281 + ... + 4045300.

Almost surely, 2^80905810 is an apocalyptic number.

80905810 is a deficient number, since it is larger than the sum of its proper divisors (64724666).

80905810 is a wasteful number, since it uses less digits than its factorization.

80905810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8090588.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 80905810 is about 8994.7657001169. The cubic root of 80905810 is about 432.5070955656.

The spelling of 80905810 in words is "eighty million, nine hundred five thousand, eight hundred ten".