1538216064 has 192 divisors, whose sum is σ = 5518918080. Its totient is φ = 399513600.

The previous prime is 1538216039. The next prime is 1538216131. The reversal of 1538216064 is 4606128351.

It is a happy number.

1538216064 is a `hidden beast` number, since 1 + 538 + 2 + 1 + 60 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×1538216064² = 4732217319095304192, which contains 22 as substring.

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

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, 80034 + ... + 97374.

It is an arithmetic number, because the mean of its divisors is an integer number (28744365).

Almost surely, 2^1538216064 is an apocalyptic number.

1538216064 is a gapful number since it is divisible by the number (14) 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 1538216064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2759459040).

1538216064 is an abundant number, since it is smaller than the sum of its proper divisors (3980702016).

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

1538216064 is a wasteful number, since it uses less digits than its factorization.

1538216064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17379 (or 17364 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1538216064 is about 39220.0977051307. The cubic root of 1538216064 is about 1154.3542710925.

The spelling of 1538216064 in words is "one billion, five hundred thirty-eight million, two hundred sixteen thousand, sixty-four".