80961980 has 48 divisors (see below), whose sum is σ = 186157440. Its totient is φ = 29332800.

The previous prime is 80961971. The next prime is 80961989. The reversal of 80961980 is 8916908.

It is an interprime number because it is at equal distance from previous prime (80961971) and next prime (80961989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80961989) 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, 82895 + ... + 83865.

It is an arithmetic number, because the mean of its divisors is an integer number (3878280).

Almost surely, 2^80961980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80961980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93078720).

80961980 is an abundant number, since it is smaller than the sum of its proper divisors (105195460).

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

80961980 is a wasteful number, since it uses less digits than its factorization.

80961980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1370 (or 1368 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 80961980 is about 8997.8875298594. The cubic root of 80961980 is about 432.6071637955.

The spelling of 80961980 in words is "eighty million, nine hundred sixty-one thousand, nine hundred eighty".