81190480 has 40 divisors (see below), whose sum is σ = 215736192. Its totient is φ = 27836544.

The previous prime is 81190441. The next prime is 81190489. The reversal of 81190480 is 8409118.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81190489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71932 + ... + 73051.

Almost surely, 2^81190480 is an apocalyptic number.

81190480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81190480 is an abundant number, since it is smaller than the sum of its proper divisors (134545712).

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

81190480 is a wasteful number, since it uses less digits than its factorization.

81190480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145003 (or 144997 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 81190480 is about 9010.5760082250. The cubic root of 81190480 is about 433.0137657033.

Adding to 81190480 its reverse (8409118), we get a palindrome (89599598).

The spelling of 81190480 in words is "eighty-one million, one hundred ninety thousand, four hundred eighty".