78001789 has 4 divisors (see below), whose sum is σ = 78151456. Its totient is φ = 77852124.

The previous prime is 78001787. The next prime is 78001837. The reversal of 78001789 is 98710087.

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.

It is a cyclic number.

It is not a de Polignac number, because 78001789 - 2¹ = 78001787 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 (78001787) 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, 74049 + ... + 75094.

It is an arithmetic number, because the mean of its divisors is an integer number (19537864).

Almost surely, 2^78001789 is an apocalyptic number.

It is an amenable number.

78001789 is a deficient number, since it is larger than the sum of its proper divisors (149667).

78001789 is a wasteful number, since it uses less digits than its factorization.

78001789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149666.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 78001789 is about 8831.8621479278. The cubic root of 78001789 is about 427.2691347202.

The spelling of 78001789 in words is "seventy-eight million, one thousand, seven hundred eighty-nine".