71428537 has 8 divisors (see below), whose sum is σ = 75889800. Its totient is φ = 67100544.

The previous prime is 71428531. The next prime is 71428541. The reversal of 71428537 is 73582417.

It can be written as a sum of positive squares in 4 ways, for example, as 8003241 + 63425296 = 2829^2 + 7964^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71428537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71428496 and 71428505.

It is not an unprimeable number, because it can be changed into a prime (71428531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32212 + ... + 34357.

It is an arithmetic number, because the mean of its divisors is an integer number (9486225).

Almost surely, 2^71428537 is an apocalyptic number.

It is an amenable number.

71428537 is a deficient number, since it is larger than the sum of its proper divisors (4461263).

71428537 is a wasteful number, since it uses less digits than its factorization.

71428537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66635.

The product of its digits is 47040, while the sum is 37.

The square root of 71428537 is about 8451.5405104632. The cubic root of 71428537 is about 414.9132000204.

The spelling of 71428537 in words is "seventy-one million, four hundred twenty-eight thousand, five hundred thirty-seven".