71378905 has 16 divisors (see below), whose sum is σ = 93202704. Its totient is φ = 52162560.

The previous prime is 71378899. The next prime is 71378911. The reversal of 71378905 is 50987317.

It is an interprime number because it is at equal distance from previous prime (71378899) and next prime (71378911).

It can be written as a sum of positive squares in 8 ways, for example, as 19149376 + 52229529 = 4376^2 + 7227^2 .

It is not a de Polignac number, because 71378905 - 2⁵ = 71378873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645 + ... + 11965.

It is an arithmetic number, because the mean of its divisors is an integer number (5825169).

Almost surely, 2^71378905 is an apocalyptic number.

It is an amenable number.

71378905 is a deficient number, since it is larger than the sum of its proper divisors (21823799).

71378905 is a wasteful number, since it uses less digits than its factorization.

71378905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11436.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 71378905 is about 8448.6037307948. The cubic root of 71378905 is about 414.8170771713.

The spelling of 71378905 in words is "seventy-one million, three hundred seventy-eight thousand, nine hundred five".