78285971 has 4 divisors (see below), whose sum is σ = 78408744. Its totient is φ = 78163200.

The previous prime is 78285953. The next prime is 78286001. The reversal of 78285971 is 17958287.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78285971 is a prime.

It is a super-2 number, since 2×78285971² = 12257386510825682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78285931) 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, 60425 + ... + 61706.

It is an arithmetic number, because the mean of its divisors is an integer number (19602186).

Almost surely, 2^78285971 is an apocalyptic number.

78285971 is a deficient number, since it is larger than the sum of its proper divisors (122773).

78285971 is a wasteful number, since it uses less digits than its factorization.

78285971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122772.

The product of its digits is 282240, while the sum is 47.

The square root of 78285971 is about 8847.9359739998. The cubic root of 78285971 is about 427.7873922216.

The spelling of 78285971 in words is "seventy-eight million, two hundred eighty-five thousand, nine hundred seventy-one".