71402537 has 6 divisors (see below), whose sum is σ = 71729658. Its totient is φ = 71076704.

The previous prime is 71402519. The next prime is 71402543. The reversal of 71402537 is 73520417.

It can be written as a sum of positive squares in only one way, i.e., 63696361 + 7706176 = 7981^2 + 2776^2 .

It is not a de Polignac number, because 71402537 - 2²⁰ = 70353961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71402237) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120113 + ... + 120705.

It is an arithmetic number, because the mean of its divisors is an integer number (11954943).

Almost surely, 2^71402537 is an apocalyptic number.

It is an amenable number.

71402537 is a deficient number, since it is larger than the sum of its proper divisors (327121).

71402537 is an frugal number, since it uses more digits than its factorization.

71402537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1287 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 71402537 is about 8450.0021893488. The cubic root of 71402537 is about 414.8628510850.

The spelling of 71402537 in words is "seventy-one million, four hundred two thousand, five hundred thirty-seven".