80721290 has 16 divisors (see below), whose sum is σ = 156475368. Its totient is φ = 29804736.

The previous prime is 80721269. The next prime is 80721323. The reversal of 80721290 is 9212708.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 69072721 + 11648569 = 8311^2 + 3413^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310337 + ... + 310596.

Almost surely, 2^80721290 is an apocalyptic number.

80721290 is a deficient number, since it is larger than the sum of its proper divisors (75754078).

80721290 is a wasteful number, since it uses less digits than its factorization.

80721290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620953.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 80721290 is about 8984.5027686567. The cubic root of 80721290 is about 432.1780423246.

Adding to 80721290 its reverse (9212708), we get a palindrome (89933998).

The spelling of 80721290 in words is "eighty million, seven hundred twenty-one thousand, two hundred ninety".