78495947 has 4 divisors (see below), whose sum is σ = 78534720. Its totient is φ = 78457176.

The previous prime is 78495943. The next prime is 78495961. The reversal of 78495947 is 74959487.

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 78495947 - 2² = 78495943 is a prime.

It is a super-2 number, since 2×78495947² = 12323227390853618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78495943) 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, 16172 + ... + 20457.

It is an arithmetic number, because the mean of its divisors is an integer number (19633680).

Almost surely, 2^78495947 is an apocalyptic number.

78495947 is a deficient number, since it is larger than the sum of its proper divisors (38773).

78495947 is a wasteful number, since it uses less digits than its factorization.

78495947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38772.

The product of its digits is 2540160, while the sum is 53.

The square root of 78495947 is about 8859.7938463601. The cubic root of 78495947 is about 428.1695164394.

The spelling of 78495947 in words is "seventy-eight million, four hundred ninety-five thousand, nine hundred forty-seven".