71473440 has 192 divisors, whose sum is σ = 251475840. Its totient is φ = 16957440.

The previous prime is 71473411. The next prime is 71473453. The reversal of 71473440 is 4437417.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 71473398 and 71473407.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154810 + ... + 155270.

It is an arithmetic number, because the mean of its divisors is an integer number (1309770).

Almost surely, 2^71473440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71473440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125737920).

71473440 is an abundant number, since it is smaller than the sum of its proper divisors (180002400).

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

71473440 is a wasteful number, since it uses less digits than its factorization.

71473440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 71473440 is about 8454.1965910428. The cubic root of 71473440 is about 415.0001258044. Note that the first 3 decimals are identical.

The spelling of 71473440 in words is "seventy-one million, four hundred seventy-three thousand, four hundred forty".