78632971 has 4 divisors (see below), whose sum is σ = 79328952. Its totient is φ = 77936992.

The previous prime is 78632969. The next prime is 78632977. The reversal of 78632971 is 17923687.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78632971 - 2¹ = 78632969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78632977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347821 + ... + 348046.

It is an arithmetic number, because the mean of its divisors is an integer number (19832238).

Almost surely, 2^78632971 is an apocalyptic number.

78632971 is a deficient number, since it is larger than the sum of its proper divisors (695981).

78632971 is a wasteful number, since it uses less digits than its factorization.

78632971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695980.

The product of its digits is 127008, while the sum is 43.

The square root of 78632971 is about 8867.5233859291. The cubic root of 78632971 is about 428.4185118629.

The spelling of 78632971 in words is "seventy-eight million, six hundred thirty-two thousand, nine hundred seventy-one".