80721954 has 32 divisors (see below), whose sum is σ = 185172480. Its totient is φ = 26038800.

The previous prime is 80721931. The next prime is 80721961. The reversal of 80721954 is 45912708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22437 + ... + 25784.

It is an arithmetic number, because the mean of its divisors is an integer number (5786640).

Almost surely, 2^80721954 is an apocalyptic number.

80721954 is an abundant number, since it is smaller than the sum of its proper divisors (104450526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80721954 is a wasteful number, since it uses less digits than its factorization.

80721954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48263 (or 48257 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 80721954 is about 8984.5397210987. The cubic root of 80721954 is about 432.1792273298.

The spelling of 80721954 in words is "eighty million, seven hundred twenty-one thousand, nine hundred fifty-four".