78072889 has 8 divisors (see below), whose sum is σ = 79773248. Its totient is φ = 76388400.

The previous prime is 78072887. The next prime is 78072893. The reversal of 78072889 is 98827087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78072889 - 2¹ = 78072887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78072887) 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 7 ways as a sum of consecutive naturals, for example, 6259 + ... + 13975.

It is an arithmetic number, because the mean of its divisors is an integer number (9971656).

Almost surely, 2^78072889 is an apocalyptic number.

It is an amenable number.

78072889 is a deficient number, since it is larger than the sum of its proper divisors (1700359).

78072889 is a wasteful number, since it uses less digits than its factorization.

78072889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7935.

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 78072889 is about 8835.8864297817. The cubic root of 78072889 is about 427.3989164011.

It can be divided in two parts, 78072 and 889, that added together give a square (78961 = 281²).

The spelling of 78072889 in words is "seventy-eight million, seventy-two thousand, eight hundred eighty-nine".