81398295 has 72 divisors (see below), whose sum is σ = 163790640. Its totient is φ = 37079040.

The previous prime is 81398267. The next prime is 81398323. The reversal of 81398295 is 59289318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81398267) and next prime (81398323).

It is not a de Polignac number, because 81398295 - 2⁵ = 81398263 is a prime.

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 81398295.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 142771 + ... + 143339.

It is an arithmetic number, because the mean of its divisors is an integer number (2274870).

Almost surely, 2^81398295 is an apocalyptic number.

81398295 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

81398295 is an abundant number, since it is smaller than the sum of its proper divisors (82392345).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81398295 is a wasteful number, since it uses less digits than its factorization.

81398295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625 (or 605 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 81398295 is about 9022.1003652143. The cubic root of 81398295 is about 433.3828980124.

The spelling of 81398295 in words is "eighty-one million, three hundred ninety-eight thousand, two hundred ninety-five".