81075630 has 32 divisors (see below), whose sum is σ = 195237504. Its totient is φ = 21547296.

The previous prime is 81075613. The next prime is 81075647. The reversal of 81075630 is 3657018.

It is an interprime number because it is at equal distance from previous prime (81075613) and next prime (81075647).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4809 + ... + 13611.

It is an arithmetic number, because the mean of its divisors is an integer number (6101172).

Almost surely, 2^81075630 is an apocalyptic number.

81075630 is an abundant number, since it is smaller than the sum of its proper divisors (114161874).

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

81075630 is a wasteful number, since it uses less digits than its factorization.

81075630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9120.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 81075630 is about 9004.2006863463. The cubic root of 81075630 is about 432.8094925786.

The spelling of 81075630 in words is "eighty-one million, seventy-five thousand, six hundred thirty".