811513650 has 48 divisors (see below), whose sum is σ = 2021504544. Its totient is φ = 215441280.

The previous prime is 811513627. The next prime is 811513679. The reversal of 811513650 is 56315118.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 22134 + ... + 45966.

It is an arithmetic number, because the mean of its divisors is an integer number (42114678).

Almost surely, 2^811513650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 811513650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010752272).

811513650 is an abundant number, since it is smaller than the sum of its proper divisors (1209990894).

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

811513650 is a wasteful number, since it uses less digits than its factorization.

811513650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24075 (or 24070 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 811513650 is about 28487.0786498019. The cubic root of 811513650 is about 932.7500401630.

Adding to 811513650 its reverse (56315118), we get a palindrome (867828768).

The spelling of 811513650 in words is "eight hundred eleven million, five hundred thirteen thousand, six hundred fifty".