45721980 has 144 divisors (see below), whose sum is σ = 151351200. Its totient is φ = 11128320.

The previous prime is 45721937. The next prime is 45721981. The reversal of 45721980 is 8912754.

45721980 is a `hidden beast` number, since 4 + 572 + 1 + 9 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 461 × 261 × 380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45721981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98950 + ... + 99410.

It is an arithmetic number, because the mean of its divisors is an integer number (1051050).

Almost surely, 2^45721980 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 45721980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75675600).

45721980 is an abundant number, since it is smaller than the sum of its proper divisors (105629220).

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

45721980 is a wasteful number, since it uses less digits than its factorization.

45721980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 519 counting only the distinct ones).

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

The square root of 45721980 is about 6761.8030139897. The cubic root of 45721980 is about 357.5814735984.

The spelling of 45721980 in words is "forty-five million, seven hundred twenty-one thousand, nine hundred eighty".