388778478245 has 8 divisors (see below), whose sum is σ = 466605668760. Its totient is φ = 310975119360.

The previous prime is 388778478241. The next prime is 388778478281. The reversal of 388778478245 is 542874877883.

It can be written as a sum of positive squares in 4 ways, for example, as 33726955201 + 355051523044 = 183649^2 + 595862^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 388778478245 - 2² = 388778478241 is a prime.

It is a super-2 number, since 2×388778478245² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388778478241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5921996 + ... + 5987285.

It is an arithmetic number, because the mean of its divisors is an integer number (58325708595).

Almost surely, 2^388778478245 is an apocalyptic number.

It is an amenable number.

388778478245 is a deficient number, since it is larger than the sum of its proper divisors (77827190515).

388778478245 is a wasteful number, since it uses less digits than its factorization.

388778478245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11915815.

The product of its digits is 674365440, while the sum is 71.

The spelling of 388778478245 in words is "three hundred eighty-eight billion, seven hundred seventy-eight million, four hundred seventy-eight thousand, two hundred forty-five".