80679881 has 4 divisors (see below), whose sum is σ = 82002564. Its totient is φ = 79357200.

The previous prime is 80679787. The next prime is 80679899. The reversal of 80679881 is 18897608.

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 46854025 + 33825856 = 6845^2 + 5816^2 .

It is a cyclic number.

It is not a de Polignac number, because 80679881 - 2¹⁴ = 80663497 is a prime.

It is a super-2 number, since 2×80679881² = 13018486396348322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80679581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661250 + ... + 661371.

It is an arithmetic number, because the mean of its divisors is an integer number (20500641).

Almost surely, 2^80679881 is an apocalyptic number.

It is an amenable number.

80679881 is a deficient number, since it is larger than the sum of its proper divisors (1322683).

80679881 is a wasteful number, since it uses less digits than its factorization.

80679881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322682.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 80679881 is about 8982.1980049429. The cubic root of 80679881 is about 432.1041290626.

The spelling of 80679881 in words is "eighty million, six hundred seventy-nine thousand, eight hundred eighty-one".