78275977387 has 4 divisors (see below), whose sum is σ = 78279395920. Its totient is φ = 78272558856.

The previous prime is 78275977343. The next prime is 78275977411. The reversal of 78275977387 is 78377957287.

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 78275977387 - 2¹⁹ = 78275453099 is a prime.

It is a super-2 number, since 2×78275977387² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78275977327) 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, 1674687 + ... + 1720792.

It is an arithmetic number, because the mean of its divisors is an integer number (19569848980).

Almost surely, 2^78275977387 is an apocalyptic number.

78275977387 is a deficient number, since it is larger than the sum of its proper divisors (3418533).

78275977387 is a wasteful number, since it uses less digits than its factorization.

78275977387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3418532.

The product of its digits is 290424960, while the sum is 70.

The spelling of 78275977387 in words is "seventy-eight billion, two hundred seventy-five million, nine hundred seventy-seven thousand, three hundred eighty-seven".