80621965 has 4 divisors (see below), whose sum is σ = 96746364. Its totient is φ = 64497568.

The previous prime is 80621941. The next prime is 80621977. The reversal of 80621965 is 56912608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 47513449 + 33108516 = 6893^2 + 5754^2 .

It is a cyclic number.

It is not a de Polignac number, because 80621965 - 2¹³ = 80613773 is a prime.

It is a super-2 number, since 2×80621965² = 12999802480922450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8062192 + ... + 8062201.

It is an arithmetic number, because the mean of its divisors is an integer number (24186591).

Almost surely, 2^80621965 is an apocalyptic number.

It is an amenable number.

80621965 is a deficient number, since it is larger than the sum of its proper divisors (16124399).

80621965 is a wasteful number, since it uses less digits than its factorization.

80621965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16124398.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 80621965 is about 8978.9734936684. The cubic root of 80621965 is about 432.0007090895. Note that the first 3 decimals are identical.

The spelling of 80621965 in words is "eighty million, six hundred twenty-one thousand, nine hundred sixty-five".