71913387 has 48 divisors (see below), whose sum is σ = 123959808. Its totient is φ = 36241920.

The previous prime is 71913377. The next prime is 71913409. The reversal of 71913387 is 78331917.

It is a happy number.

It is not a de Polignac number, because 71913387 - 2⁴ = 71913371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (71913377) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81187 + ... + 82067.

It is an arithmetic number, because the mean of its divisors is an integer number (2582496).

Almost surely, 2^71913387 is an apocalyptic number.

71913387 is a deficient number, since it is larger than the sum of its proper divisors (52046421).

71913387 is a wasteful number, since it uses less digits than its factorization.

71913387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940 (or 927 counting only the distinct ones).

The product of its digits is 31752, while the sum is 39.

The square root of 71913387 is about 8480.1761184541. The cubic root of 71913387 is about 415.8498807298.

The spelling of 71913387 in words is "seventy-one million, nine hundred thirteen thousand, three hundred eighty-seven".