15384785540 has 12 divisors (see below), whose sum is σ = 32308049676. Its totient is φ = 6153914208.

The previous prime is 15384785531. The next prime is 15384785587. The reversal of 15384785540 is 4558748351.

It can be written as a sum of positive squares in 2 ways, for example, as 7523480644 + 7861304896 = 86738^2 + 88664^2 .

It is a super-2 number, since 2×15384785540² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384619619 + ... + 384619658.

It is an arithmetic number, because the mean of its divisors is an integer number (2692337473).

Almost surely, 2^15384785540 is an apocalyptic number.

15384785540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15384785540 is an abundant number, since it is smaller than the sum of its proper divisors (16923264136).

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

15384785540 is a wasteful number, since it uses less digits than its factorization.

15384785540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769239286 (or 769239284 counting only the distinct ones).

The product of its (nonzero) digits is 2688000, while the sum is 50.

The spelling of 15384785540 in words is "fifteen billion, three hundred eighty-four million, seven hundred eighty-five thousand, five hundred forty".