78098947 has 4 divisors (see below), whose sum is σ = 78550560. Its totient is φ = 77647336.

The previous prime is 78098929. The next prime is 78098981. The reversal of 78098947 is 74989087.

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 78098947 - 2¹⁹ = 77574659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78098894 and 78098903.

It is not an unprimeable number, because it can be changed into a prime (78098927) 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, 225547 + ... + 225892.

It is an arithmetic number, because the mean of its divisors is an integer number (19637640).

Almost surely, 2^78098947 is an apocalyptic number.

78098947 is a deficient number, since it is larger than the sum of its proper divisors (451613).

78098947 is a wasteful number, since it uses less digits than its factorization.

78098947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451612.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 78098947 is about 8837.3608617053. The cubic root of 78098947 is about 427.4464613823.

The spelling of 78098947 in words is "seventy-eight million, ninety-eight thousand, nine hundred forty-seven".