45721620 has 144 divisors (see below), whose sum is σ = 160288128. Its totient is φ = 10333440.

The previous prime is 45721583. The next prime is 45721639. The reversal of 45721620 is 2612754.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164922 + ... + 165198.

It is an arithmetic number, because the mean of its divisors is an integer number (1113112).

Almost surely, 2^45721620 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 45721620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80144064).

45721620 is an abundant number, since it is smaller than the sum of its proper divisors (114566508).

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

45721620 is a wasteful number, since it uses less digits than its factorization.

45721620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 45721620 is about 6761.7763938184. The cubic root of 45721620 is about 357.5805351025.

The spelling of 45721620 in words is "forty-five million, seven hundred twenty-one thousand, six hundred twenty".