816641430 has 64 divisors (see below), whose sum is σ = 2195935488. Its totient is φ = 192620160.

The previous prime is 816641429. The next prime is 816641443. The reversal of 816641430 is 34146618.

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

It is a junction number, because it is equal to n+sod(n) for n = 816641391 and 816641400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21232 + ... + 45651.

It is an arithmetic number, because the mean of its divisors is an integer number (34311492).

Almost surely, 2^816641430 is an apocalyptic number.

816641430 is an abundant number, since it is smaller than the sum of its proper divisors (1379294058).

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

816641430 is a wasteful number, since it uses less digits than its factorization.

816641430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66941.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 816641430 is about 28576.9387793724. The cubic root of 816641430 is about 934.7105321814.

It can be divided in two parts, 816 and 641430, that added together give a palindrome (642246).

The spelling of 816641430 in words is "eight hundred sixteen million, six hundred forty-one thousand, four hundred thirty".