81472880 has 20 divisors (see below), whose sum is σ = 189424632. Its totient is φ = 32589120.

The previous prime is 81472879. The next prime is 81472889. The reversal of 81472880 is 8827418.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81472889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509126 + ... + 509285.

Almost surely, 2^81472880 is an apocalyptic number.

81472880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81472880 is an abundant number, since it is smaller than the sum of its proper divisors (107951752).

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

81472880 is a wasteful number, since it uses less digits than its factorization.

81472880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018424 (or 1018418 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 81472880 is about 9026.2328797788. The cubic root of 81472880 is about 433.5152267289.

The spelling of 81472880 in words is "eighty-one million, four hundred seventy-two thousand, eight hundred eighty".