81467040 has 96 divisors (see below), whose sum is σ = 259640640. Its totient is φ = 21469184.

The previous prime is 81466999. The next prime is 81467047. The reversal of 81467040 is 4076418.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 81466989 and 81467007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81467047) 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, 41767 + ... + 43673.

It is an arithmetic number, because the mean of its divisors is an integer number (2704590).

Almost surely, 2^81467040 is an apocalyptic number.

81467040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81467040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129820320).

81467040 is an abundant number, since it is smaller than the sum of its proper divisors (178173600).

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

81467040 is a wasteful number, since it uses less digits than its factorization.

81467040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 81467040 is about 9025.9093724677. The cubic root of 81467040 is about 433.5048683151.

The spelling of 81467040 in words is "eighty-one million, four hundred sixty-seven thousand, forty".