71978357 has 32 divisors (see below), whose sum is σ = 87070464. Its totient is φ = 58752000.

The previous prime is 71978351. The next prime is 71978369. The reversal of 71978357 is 75387917.

It is not a de Polignac number, because 71978357 - 2⁴ = 71978341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71978351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 698768 + ... + 698870.

It is an arithmetic number, because the mean of its divisors is an integer number (2720952).

Almost surely, 2^71978357 is an apocalyptic number.

It is an amenable number.

71978357 is a deficient number, since it is larger than the sum of its proper divisors (15092107).

71978357 is a wasteful number, since it uses less digits than its factorization.

71978357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 370440, while the sum is 47.

The square root of 71978357 is about 8484.0059523789. The cubic root of 71978357 is about 415.9750759383.

The spelling of 71978357 in words is "seventy-one million, nine hundred seventy-eight thousand, three hundred fifty-seven".