978279787 has 4 divisors (see below), whose sum is σ = 978824776. Its totient is φ = 977734800.

The previous prime is 978279781. The next prime is 978279793. The reversal of 978279787 is 787972879.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 787972879 = 271 ⋅2907649.

It is an interprime number because it is at equal distance from previous prime (978279781) and next prime (978279793).

It is a cyclic number.

It is not a de Polignac number, because 978279787 - 2²³ = 969891179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978279781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269793 + ... + 273394.

It is an arithmetic number, because the mean of its divisors is an integer number (244706194).

Almost surely, 2^978279787 is an apocalyptic number.

978279787 is a deficient number, since it is larger than the sum of its proper divisors (544989).

978279787 is a wasteful number, since it uses less digits than its factorization.

978279787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544988.

The product of its digits is 24893568, while the sum is 64.

The square root of 978279787 is about 31277.4645231994. The cubic root of 978279787 is about 992.7068685402.

The spelling of 978279787 in words is "nine hundred seventy-eight million, two hundred seventy-nine thousand, seven hundred eighty-seven".