81652623 has 16 divisors (see below), whose sum is σ = 117636960. Its totient is φ = 50079744.

The previous prime is 81652621. The next prime is 81652643. The reversal of 81652623 is 32625618.

It is not a de Polignac number, because 81652623 - 2¹ = 81652621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81652621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8863 + ... + 15551.

It is an arithmetic number, because the mean of its divisors is an integer number (7352310).

Almost surely, 2^81652623 is an apocalyptic number.

81652623 is a deficient number, since it is larger than the sum of its proper divisors (35984337).

81652623 is a wasteful number, since it uses less digits than its factorization.

81652623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7018.

The product of its digits is 17280, while the sum is 33.

The square root of 81652623 is about 9036.1840950702. The cubic root of 81652623 is about 433.8337952921.

The spelling of 81652623 in words is "eighty-one million, six hundred fifty-two thousand, six hundred twenty-three".