71396778 has 16 divisors (see below), whose sum is σ = 143174880. Its totient is φ = 23735376.

The previous prime is 71396749. The next prime is 71396783. The reversal of 71396778 is 87769317.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13425 + ... + 17972.

It is an arithmetic number, because the mean of its divisors is an integer number (8948430).

Almost surely, 2^71396778 is an apocalyptic number.

71396778 is an abundant number, since it is smaller than the sum of its proper divisors (71778102).

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

71396778 is a wasteful number, since it uses less digits than its factorization.

71396778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31781.

The product of its digits is 444528, while the sum is 48.

The square root of 71396778 is about 8449.6614133349. The cubic root of 71396778 is about 414.8516971424.

The spelling of 71396778 in words is "seventy-one million, three hundred ninety-six thousand, seven hundred seventy-eight".