81759465 has 24 divisors (see below), whose sum is σ = 141935040. Its totient is φ = 43537824.

The previous prime is 81759401. The next prime is 81759473. The reversal of 81759465 is 56495718.

It is not a de Polignac number, because 81759465 - 2⁶ = 81759401 is a prime.

It is a super-2 number, since 2×81759465² = 13369220234172450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81759465.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44964 + ... + 46746.

It is an arithmetic number, because the mean of its divisors is an integer number (5913960).

Almost surely, 2^81759465 is an apocalyptic number.

It is an amenable number.

81759465 is a deficient number, since it is larger than the sum of its proper divisors (60175575).

81759465 is a wasteful number, since it uses less digits than its factorization.

81759465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813 (or 2810 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 81759465 is about 9042.0940605592. The cubic root of 81759465 is about 434.0229358503.

The spelling of 81759465 in words is "eighty-one million, seven hundred fifty-nine thousand, four hundred sixty-five".