80991950 has 48 divisors (see below), whose sum is σ = 165364416. Its totient is φ = 29328000.

The previous prime is 80991949. The next prime is 80991971. The reversal of 80991950 is 5919908.

It is a junction number, because it is equal to n+sod(n) for n = 80991898 and 80991907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33275 + ... + 35625.

It is an arithmetic number, because the mean of its divisors is an integer number (3445092).

Almost surely, 2^80991950 is an apocalyptic number.

80991950 is an abundant number, since it is smaller than the sum of its proper divisors (84372466).

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

80991950 is a wasteful number, since it uses less digits than its factorization.

80991950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429 (or 2424 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 80991950 is about 8999.5527666657. The cubic root of 80991950 is about 432.6605371494.

The spelling of 80991950 in words is "eighty million, nine hundred ninety-one thousand, nine hundred fifty".