8538537840 has 80 divisors (see below), whose sum is σ = 30250825728. Its totient is φ = 1951665408.

The previous prime is 8538537797. The next prime is 8538537853. The reversal of 8538537840 is 487358358.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×8538537840² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2539552 + ... + 2542911.

Almost surely, 2^8538537840 is an apocalyptic number.

8538537840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8538537840 is an abundant number, since it is smaller than the sum of its proper divisors (21712287888).

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

8538537840 is a wasteful number, since it uses less digits than its factorization.

8538537840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5082486 (or 5082480 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 51.

The square root of 8538537840 is about 92404.2089950452. The cubic root of 8538537840 is about 2043.9071793001.

The spelling of 8538537840 in words is "eight billion, five hundred thirty-eight million, five hundred thirty-seven thousand, eight hundred forty".