1538617650 has 48 divisors (see below), whose sum is σ = 3836921088. Its totient is φ = 408024000.

The previous prime is 1538617631. The next prime is 1538617687. The reversal of 1538617650 is 567168351.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1186 + ... + 55485.

It is an arithmetic number, because the mean of its divisors is an integer number (79935856).

Almost surely, 2^1538617650 is an apocalyptic number.

1538617650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538617650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1918460544).

1538617650 is an abundant number, since it is smaller than the sum of its proper divisors (2298303438).

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

1538617650 is a wasteful number, since it uses less digits than its factorization.

1538617650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56867 (or 56862 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 1538617650 is about 39225.2170166081. The cubic root of 1538617650 is about 1154.4547190918.

The spelling of 1538617650 in words is "one billion, five hundred thirty-eight million, six hundred seventeen thousand, six hundred fifty".