73818905987 has 16 divisors (see below), whose sum is σ = 75886761600. Its totient is φ = 71773212672.

The previous prime is 73818905983. The next prime is 73818905989. The reversal of 73818905987 is 78950981837.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 73818905987 - 2² = 73818905983 is a prime.

It is a super-2 number, since 2×73818905987² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73818905983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4909493 + ... + 4924505.

It is an arithmetic number, because the mean of its divisors is an integer number (4742922600).

Almost surely, 2^73818905987 is an apocalyptic number.

73818905987 is a deficient number, since it is larger than the sum of its proper divisors (2067855613).

73818905987 is a wasteful number, since it uses less digits than its factorization.

73818905987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15742.

The product of its (nonzero) digits is 30481920, while the sum is 65.

The spelling of 73818905987 in words is "seventy-three billion, eight hundred eighteen million, nine hundred five thousand, nine hundred eighty-seven".