78402836477 has 4 divisors (see below), whose sum is σ = 89603241696. Its totient is φ = 67202431260.

The previous prime is 78402836459. The next prime is 78402836489. The reversal of 78402836477 is 77463820487.

It is a happy number.

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 78402836477 - 2²² = 78398642173 is a prime.

It is a super-2 number, since 2×78402836477² (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 (78402896477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5600202599 + ... + 5600202612.

It is an arithmetic number, because the mean of its divisors is an integer number (22400810424).

Almost surely, 2^78402836477 is an apocalyptic number.

It is an amenable number.

78402836477 is a deficient number, since it is larger than the sum of its proper divisors (11200405219).

78402836477 is a wasteful number, since it uses less digits than its factorization.

78402836477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11200405218.

The product of its (nonzero) digits is 12644352, while the sum is 56.

The spelling of 78402836477 in words is "seventy-eight billion, four hundred two million, eight hundred thirty-six thousand, four hundred seventy-seven".