78971770 has 8 divisors (see below), whose sum is σ = 142149204. Its totient is φ = 31588704.

The previous prime is 78971741. The next prime is 78971773. The reversal of 78971770 is 7717987.

It can be written as a sum of positive squares in 2 ways, for example, as 76510009 + 2461761 = 8747^2 + 1569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78971770.

It is not an unprimeable number, because it can be changed into a prime (78971773) 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 3 ways as a sum of consecutive naturals, for example, 3948579 + ... + 3948598.

Almost surely, 2^78971770 is an apocalyptic number.

78971770 is a deficient number, since it is larger than the sum of its proper divisors (63177434).

78971770 is a wasteful number, since it uses less digits than its factorization.

78971770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7897184.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 78971770 is about 8886.6062138479. The cubic root of 78971770 is about 429.0329267294.

The spelling of 78971770 in words is "seventy-eight million, nine hundred seventy-one thousand, seven hundred seventy".