71473140 has 36 divisors (see below), whose sum is σ = 216802404. Its totient is φ = 19059456.

The previous prime is 71473109. The next prime is 71473147. The reversal of 71473140 is 4137417.

It can be written as a sum of positive squares in 2 ways, for example, as 44036496 + 27436644 = 6636^2 + 5238^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71473147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198357 + ... + 198716.

It is an arithmetic number, because the mean of its divisors is an integer number (6022289).

Almost surely, 2^71473140 is an apocalyptic number.

It is an amenable number.

71473140 is an abundant number, since it is smaller than the sum of its proper divisors (145329264).

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

71473140 is a wasteful number, since it uses less digits than its factorization.

71473140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397088 (or 397083 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 71473140 is about 8454.1788483566. The cubic root of 71473140 is about 414.9995451681. Note that the first 3 decimals are identical.

The spelling of 71473140 in words is "seventy-one million, four hundred seventy-three thousand, one hundred forty".