71428253 has 4 divisors (see below), whose sum is σ = 76922748. Its totient is φ = 65933760.

The previous prime is 71428243. The next prime is 71428319. The reversal of 71428253 is 35282417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35282417 = 317 ⋅111301.

It can be written as a sum of positive squares in 2 ways, for example, as 24820324 + 46607929 = 4982^2 + 6827^2 .

It is a cyclic number.

It is not a de Polignac number, because 71428253 - 2⁸ = 71427997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71428213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2747228 + ... + 2747253.

It is an arithmetic number, because the mean of its divisors is an integer number (19230687).

Almost surely, 2^71428253 is an apocalyptic number.

It is an amenable number.

71428253 is a deficient number, since it is larger than the sum of its proper divisors (5494495).

71428253 is a wasteful number, since it uses less digits than its factorization.

71428253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5494494.

The product of its digits is 13440, while the sum is 32.

The square root of 71428253 is about 8451.5237087758. The cubic root of 71428253 is about 414.9126501211.

The spelling of 71428253 in words is "seventy-one million, four hundred twenty-eight thousand, two hundred fifty-three".