81652305 has 16 divisors (see below), whose sum is σ = 149307264. Its totient is φ = 37326720.

The previous prime is 81652273. The next prime is 81652321. The reversal of 81652305 is 50325618.

It is not a de Polignac number, because 81652305 - 2⁵ = 81652273 is a prime.

It is an alternating number because its digits alternate between even and odd.

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, 388716 + ... + 388925.

It is an arithmetic number, because the mean of its divisors is an integer number (9331704).

Almost surely, 2^81652305 is an apocalyptic number.

It is an amenable number.

81652305 is a deficient number, since it is larger than the sum of its proper divisors (67654959).

81652305 is a wasteful number, since it uses less digits than its factorization.

81652305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777656.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 81652305 is about 9036.1664991300. The cubic root of 81652305 is about 433.8332320960.

The spelling of 81652305 in words is "eighty-one million, six hundred fifty-two thousand, three hundred five".