73115015820 has 144 divisors (see below), whose sum is σ = 259795807488. Its totient is φ = 15192723840.

The previous prime is 73115015741. The next prime is 73115015821. The reversal of 73115015820 is 2851051137.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (73115015821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1098072 + ... + 1162751.

It is an arithmetic number, because the mean of its divisors is an integer number (1804137552).

Almost surely, 2^73115015820 is an apocalyptic number.

73115015820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

73115015820 is an abundant number, since it is smaller than the sum of its proper divisors (186680791668).

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

73115015820 is a wasteful number, since it uses less digits than its factorization.

73115015820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260860 (or 2260851 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 33.

Adding to 73115015820 its reverse (2851051137), we get a palindrome (75966066957).

The spelling of 73115015820 in words is "seventy-three billion, one hundred fifteen million, fifteen thousand, eight hundred twenty".