7855478477 has 48 divisors (see below), whose sum is σ = 10121448960. Its totient is φ = 5921220000.

The previous prime is 7855478453. The next prime is 7855478479. The reversal of 7855478477 is 7748745587.

It is not a de Polignac number, because 7855478477 - 2²⁸ = 7587043021 is a prime.

It is a super-2 number, since 2×7855478477² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7855478479) 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 47 ways as a sum of consecutive naturals, for example, 31296602 + ... + 31296852.

It is an arithmetic number, because the mean of its divisors is an integer number (210863520).

Almost surely, 2^7855478477 is an apocalyptic number.

7855478477 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

7855478477 is a deficient number, since it is larger than the sum of its proper divisors (2265970483).

7855478477 is a wasteful number, since it uses less digits than its factorization.

7855478477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 411 counting only the distinct ones).

The product of its digits is 61465600, while the sum is 62.

The square root of 7855478477 is about 88631.1371753742. The cubic root of 7855478477 is about 1987.8832805478.

The spelling of 7855478477 in words is "seven billion, eight hundred fifty-five million, four hundred seventy-eight thousand, four hundred seventy-seven".