71428553 has 8 divisors (see below), whose sum is σ = 81765120. Its totient is φ = 61125120.

The previous prime is 71428549. The next prime is 71428559. The reversal of 71428553 is 35582417.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71428553 - 2² = 71428549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71428559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3473 + ... + 12446.

It is an arithmetic number, because the mean of its divisors is an integer number (10220640).

Almost surely, 2^71428553 is an apocalyptic number.

It is an amenable number.

71428553 is a deficient number, since it is larger than the sum of its proper divisors (10336567).

71428553 is a wasteful number, since it uses less digits than its factorization.

71428553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16567.

The product of its digits is 33600, while the sum is 35.

The square root of 71428553 is about 8451.5414570361. The cubic root of 71428553 is about 414.9132310006.

The spelling of 71428553 in words is "seventy-one million, four hundred twenty-eight thousand, five hundred fifty-three".