71253420 has 96 divisors (see below), whose sum is σ = 240038400. Its totient is φ = 15427584.

The previous prime is 71253397. The next prime is 71253433. The reversal of 71253420 is 2435217.

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, 3516 + ... + 12444.

It is an arithmetic number, because the mean of its divisors is an integer number (2500400).

Almost surely, 2^71253420 is an apocalyptic number.

71253420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71253420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120019200).

71253420 is an abundant number, since it is smaller than the sum of its proper divisors (168784980).

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

71253420 is a wasteful number, since it uses less digits than its factorization.

71253420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8967 (or 8965 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 71253420 is about 8441.1740889523. The cubic root of 71253420 is about 414.5738500618.

Adding to 71253420 its reverse (2435217), we get a palindrome (73688637).

The spelling of 71253420 in words is "seventy-one million, two hundred fifty-three thousand, four hundred twenty".