81465480 has 64 divisors (see below), whose sum is σ = 271555200. Its totient is φ = 21723840.

The previous prime is 81465473. The next prime is 81465487. The reversal of 81465480 is 8456418.

It is an interprime number because it is at equal distance from previous prime (81465473) and next prime (81465487).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81465487) 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, 36636 + ... + 38795.

It is an arithmetic number, because the mean of its divisors is an integer number (4243050).

Almost surely, 2^81465480 is an apocalyptic number.

It is an amenable number.

81465480 is an abundant number, since it is smaller than the sum of its proper divisors (190089720).

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

81465480 is a wasteful number, since it uses less digits than its factorization.

81465480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75451 (or 75441 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 81465480 is about 9025.8229541688. The cubic root of 81465480 is about 433.5021012578.

The spelling of 81465480 in words is "eighty-one million, four hundred sixty-five thousand, four hundred eighty".