81390435 has 16 divisors (see below), whose sum is σ = 148828416. Its totient is φ = 37207008.

The previous prime is 81390383. The next prime is 81390473. The reversal of 81390435 is 53409318.

It is not a de Polignac number, because 81390435 - 2¹¹ = 81388387 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81390396 and 81390405.

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, 387469 + ... + 387678.

It is an arithmetic number, because the mean of its divisors is an integer number (9301776).

Almost surely, 2^81390435 is an apocalyptic number.

81390435 is a deficient number, since it is larger than the sum of its proper divisors (67437981).

81390435 is a wasteful number, since it uses less digits than its factorization.

81390435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775162.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 81390435 is about 9021.6647576819. The cubic root of 81390435 is about 433.3689480919.

The spelling of 81390435 in words is "eighty-one million, three hundred ninety thousand, four hundred thirty-five".