71503878078 has 24 divisors (see below), whose sum is σ = 155082711888. Its totient is φ = 23810373312.

The previous prime is 71503878077. The next prime is 71503878079. The reversal of 71503878078 is 87087830517.

71503878078 is a `hidden beast` number, since 71 + 50 + 387 + 80 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (71503878077) and next prime (71503878079).

It is a super-2 number, since 2×71503878078² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71503878073) 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, 2002875 + ... + 2038262.

It is an arithmetic number, because the mean of its divisors is an integer number (6461779662).

Almost surely, 2^71503878078 is an apocalyptic number.

71503878078 is an abundant number, since it is smaller than the sum of its proper divisors (83578833810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71503878078 is a wasteful number, since it uses less digits than its factorization.

71503878078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042128 (or 4042125 counting only the distinct ones).

The product of its (nonzero) digits is 2634240, while the sum is 54.

The spelling of 71503878078 in words is "seventy-one billion, five hundred three million, eight hundred seventy-eight thousand, seventy-eight".