80621861 has 8 divisors (see below), whose sum is σ = 82822080. Its totient is φ = 78436512.

The previous prime is 80621843. The next prime is 80621869. The reversal of 80621861 is 16812608.

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

It is a cyclic number.

It is not a de Polignac number, because 80621861 - 2²⁶ = 13512997 is a prime.

It is a super-2 number, since 2×80621861² = 12999768942206642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80621869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7745 + ... + 14873.

It is an arithmetic number, because the mean of its divisors is an integer number (10352760).

Almost surely, 2^80621861 is an apocalyptic number.

It is an amenable number.

80621861 is a deficient number, since it is larger than the sum of its proper divisors (2200219).

80621861 is a wasteful number, since it uses less digits than its factorization.

80621861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7435.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 80621861 is about 8978.9677023587. The cubic root of 80621861 is about 432.0005233333. Note that the first 3 decimals are identical.

The spelling of 80621861 in words is "eighty million, six hundred twenty-one thousand, eight hundred sixty-one".