80721622 has 4 divisors (see below), whose sum is σ = 121082436. Its totient is φ = 40360810.

The previous prime is 80721583. The next prime is 80721629. The reversal of 80721622 is 22612708.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80721629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20180404 + ... + 20180407.

It is an arithmetic number, because the mean of its divisors is an integer number (30270609).

Almost surely, 2^80721622 is an apocalyptic number.

80721622 is a deficient number, since it is larger than the sum of its proper divisors (40360814).

80721622 is a wasteful number, since it uses less digits than its factorization.

80721622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40360813.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 80721622 is about 8984.5212448967. The cubic root of 80721622 is about 432.1786348280.

It can be divided in two parts, 8072162 and 2, that multiplied together give a square (16144324 = 4018²).

The spelling of 80721622 in words is "eighty million, seven hundred twenty-one thousand, six hundred twenty-two".