81363464 has 64 divisors (see below), whose sum is σ = 190458240. Its totient is φ = 31726080.

The previous prime is 81363461. The next prime is 81363467. The reversal of 81363464 is 46436318.

It is an interprime number because it is at equal distance from previous prime (81363461) and next prime (81363467).

It is not an unprimeable number, because it can be changed into a prime (81363461) 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, 52379 + ... + 53909.

It is an arithmetic number, because the mean of its divisors is an integer number (2975910).

Almost surely, 2^81363464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81363464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95229120).

81363464 is an abundant number, since it is smaller than the sum of its proper divisors (109094776).

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

81363464 is a wasteful number, since it uses less digits than its factorization.

81363464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630 (or 1626 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The square root of 81363464 is about 9020.1698431903. The cubic root of 81363464 is about 433.3210731574.

The spelling of 81363464 in words is "eighty-one million, three hundred sixty-three thousand, four hundred sixty-four".