15780135240 has 96 divisors (see below), whose sum is σ = 51304102200. Its totient is φ = 4206504960.

The previous prime is 15780135211. The next prime is 15780135271. The reversal of 15780135240 is 4253108751.

15780135240 is a `hidden beast` number, since 1 + 57 + 80 + 1 + 3 + 524 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13408250436 + 2371884804 = 115794^2 + 48702^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 15780135195 and 15780135204.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1264230 + ... + 1276650.

Almost surely, 2^15780135240 is an apocalyptic number.

15780135240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15780135240 is an abundant number, since it is smaller than the sum of its proper divisors (35523966960).

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

15780135240 is a wasteful number, since it uses less digits than its factorization.

15780135240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15967 (or 15960 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 15780135240 in words is "fifteen billion, seven hundred eighty million, one hundred thirty-five thousand, two hundred forty".