42378887864 has 8 divisors (see below), whose sum is σ = 79460414760. Its totient is φ = 21189443928.

The previous prime is 42378887773. The next prime is 42378887867. The reversal of 42378887864 is 46878887324.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×42378887864³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42378887864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42378887867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2648680484 + ... + 2648680499.

It is an arithmetic number, because the mean of its divisors is an integer number (9932551845).

Almost surely, 2^42378887864 is an apocalyptic number.

It is an amenable number.

42378887864 is a deficient number, since it is larger than the sum of its proper divisors (37081526896).

42378887864 is a wasteful number, since it uses less digits than its factorization.

42378887864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5297360989 (or 5297360985 counting only the distinct ones).

The product of its digits is 115605504, while the sum is 65.

The spelling of 42378887864 in words is "forty-two billion, three hundred seventy-eight million, eight hundred eighty-seven thousand, eight hundred sixty-four".