78940619 has 4 divisors (see below), whose sum is σ = 78969120. Its totient is φ = 78912120.

The previous prime is 78940613. The next prime is 78940627. The reversal of 78940619 is 91604987.

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 78940619 - 2⁸ = 78940363 is a prime.

It is a super-2 number, since 2×78940619² = 12463242656206322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78940619.

It is not an unprimeable number, because it can be changed into a prime (78940613) 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, 9587 + ... + 15804.

It is an arithmetic number, because the mean of its divisors is an integer number (19742280).

Almost surely, 2^78940619 is an apocalyptic number.

78940619 is a deficient number, since it is larger than the sum of its proper divisors (28501).

78940619 is a wasteful number, since it uses less digits than its factorization.

78940619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28500.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 78940619 is about 8884.8533471296. The cubic root of 78940619 is about 428.9765075712.

The spelling of 78940619 in words is "seventy-eight million, nine hundred forty thousand, six hundred nineteen".