71288280 has 96 divisors (see below), whose sum is σ = 264794400. Its totient is φ = 16293888.

The previous prime is 71288263. The next prime is 71288311. The reversal of 71288280 is 8288217.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11625 + ... + 16664.

It is an arithmetic number, because the mean of its divisors is an integer number (2758275).

Almost surely, 2^71288280 is an apocalyptic number.

71288280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71288280 is an abundant number, since it is smaller than the sum of its proper divisors (193506120).

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

71288280 is a wasteful number, since it uses less digits than its factorization.

71288280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28313 (or 28306 counting only the distinct ones).

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

The square root of 71288280 is about 8443.2387150903. The cubic root of 71288280 is about 414.6414476977.

The spelling of 71288280 in words is "seventy-one million, two hundred eighty-eight thousand, two hundred eighty".