78355948323438 has 48 divisors (see below), whose sum is σ = 171149909898240. Its totient is φ = 25906889257488.

The previous prime is 78355948323403. The next prime is 78355948323463. The reversal of 78355948323438 is 83432384955387.

78355948323438 is a `hidden beast` number, since 7 + 8 + 3 + 5 + 5 + 94 + 83 + 23 + 438 = 666.

It is a super-2 number, since 2×78355948323438² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11685720 + ... + 17125067.

It is an arithmetic number, because the mean of its divisors is an integer number (3565623122880).

Almost surely, 2^{78355948323438} is an apocalyptic number.

78355948323438 is an abundant number, since it is smaller than the sum of its proper divisors (92793961574802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78355948323438 is a wasteful number, since it uses less digits than its factorization.

78355948323438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28812021 (or 28812018 counting only the distinct ones).

The product of its digits is 2090188800, while the sum is 72.

The spelling of 78355948323438 in words is "seventy-eight trillion, three hundred fifty-five billion, nine hundred forty-eight million, three hundred twenty-three thousand, four hundred thirty-eight".