1538545500 has 288 divisors, whose sum is σ = 5151444480. Its totient is φ = 385920000.

The previous prime is 1538545471. The next prime is 1538545513. The reversal of 1538545500 is 55458351.

It is a happy number.

1538545500 is a `hidden beast` number, since 1 + 53 + 8 + 54 + 550 + 0 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5719366 + ... + 5719634.

It is an arithmetic number, because the mean of its divisors is an integer number (17886960).

Almost surely, 2^1538545500 is an apocalyptic number.

1538545500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538545500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2575722240).

1538545500 is an abundant number, since it is smaller than the sum of its proper divisors (3612898980).

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

1538545500 is a wasteful number, since it uses less digits than its factorization.

1538545500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 351 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 1538545500 is about 39224.2973168418. The cubic root of 1538545500 is about 1154.4366736274.

The spelling of 1538545500 in words is "one billion, five hundred thirty-eight million, five hundred forty-five thousand, five hundred".