45240721820 has 48 divisors (see below), whose sum is σ = 108685257408. Its totient is φ = 15495744000.

The previous prime is 45240721819. The next prime is 45240721829. The reversal of 45240721820 is 2812704254.

It is a super-2 number, since 2×45240721820² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45240721829) 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, 17681 + ... + 301320.

It is an arithmetic number, because the mean of its divisors is an integer number (2264276196).

Almost surely, 2^45240721820 is an apocalyptic number.

It is an amenable number.

45240721820 is an abundant number, since it is smaller than the sum of its proper divisors (63444535588).

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

45240721820 is a wasteful number, since it uses less digits than its factorization.

45240721820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320030 (or 320028 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 35.

The spelling of 45240721820 in words is "forty-five billion, two hundred forty million, seven hundred twenty-one thousand, eight hundred twenty".