78205456287 has 16 divisors (see below), whose sum is σ = 132411354880. Its totient is φ = 44688832056.

The previous prime is 78205456253. The next prime is 78205456309. The reversal of 78205456287 is 78265450287.

78205456287 is a `hidden beast` number, since 7 + 8 + 2 + 0 + 5 + 4 + 5 + 628 + 7 = 666.

It is not a de Polignac number, because 78205456287 - 2¹⁵ = 78205423519 is a prime.

It is a super-2 number, since 2×78205456287² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78205456247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206892553 + ... + 206892930.

It is an arithmetic number, because the mean of its divisors is an integer number (8275709680).

Almost surely, 2^78205456287 is an apocalyptic number.

78205456287 is a deficient number, since it is larger than the sum of its proper divisors (54205898593).

78205456287 is a wasteful number, since it uses less digits than its factorization.

78205456287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413785499 (or 413785493 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 54.

The spelling of 78205456287 in words is "seventy-eight billion, two hundred five million, four hundred fifty-six thousand, two hundred eighty-seven".