7842178385 has 16 divisors (see below), whose sum is σ = 9452194752. Its totient is φ = 6246072000.

The previous prime is 7842178381. The next prime is 7842178397. The reversal of 7842178385 is 5838712487.

It is not a de Polignac number, because 7842178385 - 2² = 7842178381 is a prime.

It is a super-2 number, since 2×7842178385² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7842178381) 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 15 ways as a sum of consecutive naturals, for example, 1610855 + ... + 1615715.

It is an arithmetic number, because the mean of its divisors is an integer number (590762172).

Almost surely, 2^7842178385 is an apocalyptic number.

It is an amenable number.

7842178385 is a deficient number, since it is larger than the sum of its proper divisors (1610016367).

7842178385 is a wasteful number, since it uses less digits than its factorization.

7842178385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6224.

The product of its digits is 3010560, while the sum is 53.

The square root of 7842178385 is about 88556.0748057410. The cubic root of 7842178385 is about 1986.7607533021.

The spelling of 7842178385 in words is "seven billion, eight hundred forty-two million, one hundred seventy-eight thousand, three hundred eighty-five".