78072799 has 4 divisors (see below), whose sum is σ = 89226064. Its totient is φ = 66919536.

The previous prime is 78072793. The next prime is 78072811. The reversal of 78072799 is 99727087.

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 78072799 - 2⁷ = 78072671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78072793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5576622 + ... + 5576635.

It is an arithmetic number, because the mean of its divisors is an integer number (22306516).

Almost surely, 2^78072799 is an apocalyptic number.

78072799 is a deficient number, since it is larger than the sum of its proper divisors (11153265).

78072799 is a wasteful number, since it uses less digits than its factorization.

78072799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11153264.

The product of its (nonzero) digits is 444528, while the sum is 49.

The square root of 78072799 is about 8835.8813369126. The cubic root of 78072799 is about 427.3987521703.

The spelling of 78072799 in words is "seventy-eight million, seventy-two thousand, seven hundred ninety-nine".