81016630 has 16 divisors (see below), whose sum is σ = 145973664. Its totient is φ = 32374720.

The previous prime is 81016619. The next prime is 81016651. The reversal of 81016630 is 3661018.

It is a junction number, because it is equal to n+sod(n) for n = 81016595 and 81016604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8535 + ... + 15325.

It is an arithmetic number, because the mean of its divisors is an integer number (9123354).

Almost surely, 2^81016630 is an apocalyptic number.

81016630 is a deficient number, since it is larger than the sum of its proper divisors (64957034).

81016630 is a wasteful number, since it uses less digits than its factorization.

81016630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7991.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81016630 is about 9000.9238414732. The cubic root of 81016630 is about 432.7044796961.

Adding to 81016630 its reverse (3661018), we get a palindrome (84677648).

The spelling of 81016630 in words is "eighty-one million, sixteen thousand, six hundred thirty".