80790021 has 32 divisors (see below), whose sum is σ = 129467520. Its totient is φ = 49496832.

The previous prime is 80790013. The next prime is 80790067. The reversal of 80790021 is 12009708.

It is not a de Polignac number, because 80790021 - 2³ = 80790013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80790821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117946 + ... + 118628.

It is an arithmetic number, because the mean of its divisors is an integer number (4045860).

Almost surely, 2^80790021 is an apocalyptic number.

It is an amenable number.

80790021 is a deficient number, since it is larger than the sum of its proper divisors (48677499).

80790021 is a wasteful number, since it uses less digits than its factorization.

80790021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 80790021 is about 8988.3269299687. The cubic root of 80790021 is about 432.3006683894.

Adding to 80790021 its reverse (12009708), we get a palindrome (92799729).

The spelling of 80790021 in words is "eighty million, seven hundred ninety thousand, twenty-one".