80927821 has 16 divisors (see below), whose sum is σ = 92659840. Its totient is φ = 70061760.

The previous prime is 80927801. The next prime is 80927827. The reversal of 80927821 is 12872908.

It is a 3-Lehmer number, since φ(80927821) divides (80927821-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 80927821 - 2¹¹ = 80925773 is a prime.

It is a deceptive number, since it divides R_80927820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80927827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23851 + ... + 27031.

It is an arithmetic number, because the mean of its divisors is an integer number (5791240).

It is a Poulet number, since it divides 2^80927820-1.

Almost surely, 2^80927821 is an apocalyptic number.

It is an amenable number.

80927821 is a deficient number, since it is larger than the sum of its proper divisors (11732019).

80927821 is a wasteful number, since it uses less digits than its factorization.

80927821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3316.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 80927821 is about 8995.9891618432. The cubic root of 80927821 is about 432.5463142179.

The spelling of 80927821 in words is "eighty million, nine hundred twenty-seven thousand, eight hundred twenty-one".