78988368477 has 4 divisors (see below), whose sum is σ = 105317824640. Its totient is φ = 52658912316.

The previous prime is 78988368463. The next prime is 78988368509. The reversal of 78988368477 is 77486388987.

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 not a de Polignac number, because 78988368477 - 2⁴ = 78988368461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78988368399 and 78988368408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78988368077) 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, 13164728077 + ... + 13164728082.

It is an arithmetic number, because the mean of its divisors is an integer number (26329456160).

Almost surely, 2^78988368477 is an apocalyptic number.

It is an amenable number.

78988368477 is a deficient number, since it is larger than the sum of its proper divisors (26329456163).

78988368477 is a wasteful number, since it uses less digits than its factorization.

78988368477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26329456162.

The product of its digits is 910393344, while the sum is 75.

The spelling of 78988368477 in words is "seventy-eight billion, nine hundred eighty-eight million, three hundred sixty-eight thousand, four hundred seventy-seven".