812544516 has 72 divisors (see below), whose sum is σ = 2364340160. Its totient is φ = 230475456.

The previous prime is 812544511. The next prime is 812544559. The reversal of 812544516 is 615445218.

It is a happy number.

812544516 is a `hidden beast` number, since 81 + 25 + 44 + 516 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (812544511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23430 + ... + 46626.

Almost surely, 2^812544516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 812544516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1182170080).

812544516 is an abundant number, since it is smaller than the sum of its proper divisors (1551795644).

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

812544516 is a wasteful number, since it uses less digits than its factorization.

812544516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23353 (or 23348 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 812544516 is about 28505.1664790788. The cubic root of 812544516 is about 933.1448305820.

The spelling of 812544516 in words is "eight hundred twelve million, five hundred forty-four thousand, five hundred sixteen".