78981017 has 4 divisors (see below), whose sum is σ = 79208976. Its totient is φ = 78753060.

The previous prime is 78980939. The next prime is 78981029. The reversal of 78981017 is 71018987.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71018987 = 13 ⋅5462999.

It is a cyclic number.

It is not a de Polignac number, because 78981017 - 2¹⁸ = 78718873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78981037) 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, 113459 + ... + 114152.

It is an arithmetic number, because the mean of its divisors is an integer number (19802244).

Almost surely, 2^78981017 is an apocalyptic number.

It is an amenable number.

78981017 is a deficient number, since it is larger than the sum of its proper divisors (227959).

78981017 is a wasteful number, since it uses less digits than its factorization.

78981017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227958.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 78981017 is about 8887.1264759764. The cubic root of 78981017 is about 429.0496715850.

The spelling of 78981017 in words is "seventy-eight million, nine hundred eighty-one thousand, seventeen".