15783897220 has 48 divisors (see below), whose sum is σ = 40795308288. Its totient is φ = 4995342720.

The previous prime is 15783897203. The next prime is 15783897221. The reversal of 15783897220 is 2279838751.

It is a super-2 number, since 2×15783897220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (15783897221) 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, 4334416 + ... + 4338055.

It is an arithmetic number, because the mean of its divisors is an integer number (849902256).

Almost surely, 2^15783897220 is an apocalyptic number.

15783897220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15783897220 is an abundant number, since it is smaller than the sum of its proper divisors (25011411068).

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

15783897220 is a wasteful number, since it uses less digits than its factorization.

15783897220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8672500 (or 8672498 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 15783897220 in words is "fifteen billion, seven hundred eighty-three million, eight hundred ninety-seven thousand, two hundred twenty".