78697019 has 4 divisors (see below), whose sum is σ = 79419120. Its totient is φ = 77974920.

The previous prime is 78697013. The next prime is 78697027. The reversal of 78697019 is 91079687.

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 78697019 - 2⁸ = 78696763 is a prime.

It is a super-2 number, since 2×78697019² = 12386441598972722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78697013) 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, 360887 + ... + 361104.

It is an arithmetic number, because the mean of its divisors is an integer number (19854780).

Almost surely, 2^78697019 is an apocalyptic number.

78697019 is a deficient number, since it is larger than the sum of its proper divisors (722101).

78697019 is a wasteful number, since it uses less digits than its factorization.

78697019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722100.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 78697019 is about 8871.1340312273. The cubic root of 78697019 is about 428.5347985466.

The spelling of 78697019 in words is "seventy-eight million, six hundred ninety-seven thousand, nineteen".