80921940 has 48 divisors (see below), whose sum is σ = 247181760. Its totient is φ = 19617280.

The previous prime is 80921933. The next prime is 80921947. The reversal of 80921940 is 4912908.

It is an interprime number because it is at equal distance from previous prime (80921933) and next prime (80921947).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80921947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60645 + ... + 61964.

It is an arithmetic number, because the mean of its divisors is an integer number (5149620).

Almost surely, 2^80921940 is an apocalyptic number.

It is an amenable number.

80921940 is an abundant number, since it is smaller than the sum of its proper divisors (166259820).

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

80921940 is a wasteful number, since it uses less digits than its factorization.

80921940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122632 (or 122630 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 80921940 is about 8995.6622880142. The cubic root of 80921940 is about 432.5358362946.

The spelling of 80921940 in words is "eighty million, nine hundred twenty-one thousand, nine hundred forty".