726321980 has 12 divisors (see below), whose sum is σ = 1525276200. Its totient is φ = 290528784.

The previous prime is 726321931. The next prime is 726321983. The reversal of 726321980 is 89123627.

It is a super-2 number, since 2×726321980² = 1055087237262240800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726321983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18158030 + ... + 18158069.

It is an arithmetic number, because the mean of its divisors is an integer number (127106350).

Almost surely, 2^726321980 is an apocalyptic number.

It is an amenable number.

726321980 is an abundant number, since it is smaller than the sum of its proper divisors (798954220).

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

726321980 is a wasteful number, since it uses less digits than its factorization.

726321980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36316108 (or 36316106 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 726321980 is about 26950.3614075953. The cubic root of 726321980 is about 898.8965818964.

The spelling of 726321980 in words is "seven hundred twenty-six million, three hundred twenty-one thousand, nine hundred eighty".