71428491 has 12 divisors (see below), whose sum is σ = 103471368. Its totient is φ = 47481984.

The previous prime is 71428481. The next prime is 71428493. The reversal of 71428491 is 19482417.

It is not a de Polignac number, because 71428491 - 2¹³ = 71420299 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (71428493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8065 + ... + 14418.

It is an arithmetic number, because the mean of its divisors is an integer number (8622614).

Almost surely, 2^71428491 is an apocalyptic number.

71428491 is a deficient number, since it is larger than the sum of its proper divisors (32042877).

71428491 is a wasteful number, since it uses less digits than its factorization.

71428491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22842 (or 22839 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 71428491 is about 8451.5377890654. The cubic root of 71428491 is about 414.9131109523.

The spelling of 71428491 in words is "seventy-one million, four hundred twenty-eight thousand, four hundred ninety-one".