7881378 has 16 divisors (see below), whose sum is σ = 16271616. Its totient is φ = 2542320.

The previous prime is 7881373. The next prime is 7881487. The reversal of 7881378 is 8731887.

It is a super-2 number, since 2×7881378² = 124232238357768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7881373) 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, 21001 + ... + 21372.

It is an arithmetic number, because the mean of its divisors is an integer number (1016976).

Almost surely, 2^7881378 is an apocalyptic number.

7881378 is an abundant number, since it is smaller than the sum of its proper divisors (8390238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7881378 is a wasteful number, since it uses less digits than its factorization.

7881378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42409.

The product of its digits is 75264, while the sum is 42.

The square root of 7881378 is about 2807.3792048813. The cubic root of 7881378 is about 199.0065568574.

The spelling of 7881378 in words is "seven million, eight hundred eighty-one thousand, three hundred seventy-eight".