81470880 has 96 divisors (see below), whose sum is σ = 285163200. Its totient is φ = 21724416.

The previous prime is 81470863. The next prime is 81470903. The reversal of 81470880 is 8807418.

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 (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5110 + ... + 13749.

It is an arithmetic number, because the mean of its divisors is an integer number (2970450).

Almost surely, 2^81470880 is an apocalyptic number.

81470880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81470880 is an abundant number, since it is smaller than the sum of its proper divisors (203692320).

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

81470880 is a wasteful number, since it uses less digits than its factorization.

81470880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18883 (or 18869 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 81470880 is about 9026.1220909093. The cubic root of 81470880 is about 433.5116793827.

The spelling of 81470880 in words is "eighty-one million, four hundred seventy thousand, eight hundred eighty".