78775971 has 8 divisors (see below), whose sum is σ = 105095760. Its totient is φ = 52486752.

The previous prime is 78775969. The next prime is 78775973. The reversal of 78775971 is 17957787.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78775969) and next prime (78775973).

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

It is not a de Polignac number, because 78775971 - 2¹ = 78775969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78775973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736 + ... + 12573.

It is an arithmetic number, because the mean of its divisors is an integer number (13136970).

Almost surely, 2^78775971 is an apocalyptic number.

78775971 is a deficient number, since it is larger than the sum of its proper divisors (26319789).

78775971 is a wasteful number, since it uses less digits than its factorization.

78775971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15285.

The product of its digits is 864360, while the sum is 51.

The square root of 78775971 is about 8875.5828541003. The cubic root of 78775971 is about 428.6780584045.

The spelling of 78775971 in words is "seventy-eight million, seven hundred seventy-five thousand, nine hundred seventy-one".