387878828121213 has 128 divisors (see below), whose sum is σ = 646740363354624. Its totient is φ = 203147531059200.

The previous prime is 387878828121209. The next prime is 387878828121221. The reversal of 387878828121213 is 312121828878783.

387878828121213 is an astonishing number since 387878828121213 = 3878788 + ... + 28121213.

It is not a de Polignac number, because 387878828121213 - 2² = 387878828121209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387878828121203) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6799971973 + ... + 6800029013.

It is an arithmetic number, because the mean of its divisors is an integer number (5052659088708).

Almost surely, 2^{387878828121213} is an apocalyptic number.

387878828121213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

387878828121213 is a deficient number, since it is larger than the sum of its proper divisors (258861535233411).

387878828121213 is a wasteful number, since it uses less digits than its factorization.

387878828121213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62015.

The product of its digits is 115605504, while the sum is 69.

The spelling of 387878828121213 in words is "three hundred eighty-seven trillion, eight hundred seventy-eight billion, eight hundred twenty-eight million, one hundred twenty-one thousand, two hundred thirteen".