80821477 has 4 divisors (see below), whose sum is σ = 88168896. Its totient is φ = 73474060.

The previous prime is 80821469. The next prime is 80821483. The reversal of 80821477 is 77412808.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80821477 - 2³ = 80821469 is a prime.

It is a super-2 number, since 2×80821477² = 13064222288923058, 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 (80821457) 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, 3673693 + ... + 3673714.

It is an arithmetic number, because the mean of its divisors is an integer number (22042224).

Almost surely, 2^80821477 is an apocalyptic number.

It is an amenable number.

80821477 is a deficient number, since it is larger than the sum of its proper divisors (7347419).

80821477 is a wasteful number, since it uses less digits than its factorization.

80821477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7347418.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 80821477 is about 8990.0765847683. The cubic root of 80821477 is about 432.3567672539.

It can be divided in two parts, 8082 and 1477, that added together give a palindrome (9559).

The spelling of 80821477 in words is "eighty million, eight hundred twenty-one thousand, four hundred seventy-seven".