81307635 has 8 divisors (see below), whose sum is σ = 130092240. Its totient is φ = 43364064.

The previous prime is 81307609. The next prime is 81307657. The reversal of 81307635 is 53670318.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81307635 - 2¹² = 81303539 is a prime.

It is a super-2 number, since 2×81307635² = 13221863018586450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81307596 and 81307605.

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, 2710240 + ... + 2710269.

It is an arithmetic number, because the mean of its divisors is an integer number (16261530).

Almost surely, 2^81307635 is an apocalyptic number.

81307635 is a deficient number, since it is larger than the sum of its proper divisors (48784605).

81307635 is a wasteful number, since it uses less digits than its factorization.

81307635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5420517.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 81307635 is about 9017.0746364883. The cubic root of 81307635 is about 433.2219401381.

The spelling of 81307635 in words is "eighty-one million, three hundred seven thousand, six hundred thirty-five".