1520386728 has 64 divisors (see below), whose sum is σ = 4353116160. Its totient is φ = 433480896.

The previous prime is 1520386727. The next prime is 1520386729. The reversal of 1520386728 is 8276830251.

It is an interprime number because it is at equal distance from previous prime (1520386727) and next prime (1520386729).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1520386728.

It is not an unprimeable number, because it can be changed into a prime (1520386727) 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, 72525 + ... + 91107.

It is an arithmetic number, because the mean of its divisors is an integer number (68017440).

Almost surely, 2^1520386728 is an apocalyptic number.

It is an amenable number.

1520386728 is an abundant number, since it is smaller than the sum of its proper divisors (2832729432).

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

1520386728 is a wasteful number, since it uses less digits than its factorization.

1520386728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19086 (or 19082 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 1520386728 is about 38992.1367457594. The cubic root of 1520386728 is about 1149.8769189006.

It can be divided in two parts, 152038 and 6728, that added together give a triangular number (158766 = T₅₆₃).

The spelling of 1520386728 in words is "one billion, five hundred twenty million, three hundred eighty-six thousand, seven hundred twenty-eight".