78040811989 has 8 divisors (see below), whose sum is σ = 89201481408. Its totient is φ = 66883138080.

The previous prime is 78040811911. The next prime is 78040812043. The reversal of 78040811989 is 98911804087.

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 78040811989 - 2²¹ = 78038714837 is a prime.

It is a super-2 number, since 2×78040811989² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78040811389) 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 7 ways as a sum of consecutive naturals, for example, 692767 + ... + 797500.

It is an arithmetic number, because the mean of its divisors is an integer number (11150185176).

Almost surely, 2^78040811989 is an apocalyptic number.

It is an amenable number.

78040811989 is a deficient number, since it is larger than the sum of its proper divisors (11160669419).

78040811989 is a wasteful number, since it uses less digits than its factorization.

78040811989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497755.

The product of its (nonzero) digits is 1161216, while the sum is 55.

The spelling of 78040811989 in words is "seventy-eight billion, forty million, eight hundred eleven thousand, nine hundred eighty-nine".