1538028720 has 120 divisors (see below), whose sum is σ = 5437114800. Its totient is φ = 388551168.

The previous prime is 1538028703. The next prime is 1538028721. The reversal of 1538028720 is 278208351.

1538028720 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (120).

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

It is not an unprimeable number, because it can be changed into a prime (1538028721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42535 + ... + 69894.

It is an arithmetic number, because the mean of its divisors is an integer number (45309290).

Almost surely, 2^1538028720 is an apocalyptic number.

1538028720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1538028720 is an abundant number, since it is smaller than the sum of its proper divisors (3899086080).

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

1538028720 is a wasteful number, since it uses less digits than its factorization.

1538028720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112467 (or 112458 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1538028720 is about 39217.7092650756. The cubic root of 1538028720 is about 1154.3074050872.

It can be divided in two parts, 15380 and 28720, that added together give a square (44100 = 210²).

The spelling of 1538028720 in words is "one billion, five hundred thirty-eight million, twenty-eight thousand, seven hundred twenty".