7872778 has 8 divisors (see below), whose sum is σ = 11875680. Its totient is φ = 3914220.

The previous prime is 7872763. The next prime is 7872793. The reversal of 7872778 is 8772787.

It is an interprime number because it is at equal distance from previous prime (7872763) and next prime (7872793).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10638 + ... + 11353.

It is an arithmetic number, because the mean of its divisors is an integer number (1484460).

Almost surely, 2^7872778 is an apocalyptic number.

7872778 is a deficient number, since it is larger than the sum of its proper divisors (4002902).

7872778 is a wasteful number, since it uses less digits than its factorization.

7872778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22172.

The product of its digits is 307328, while the sum is 46.

The square root of 7872778 is about 2805.8471091633. The cubic root of 7872778 is about 198.9341465391.

Subtracting 7872778 from its reverse (8772787), we obtain a palindrome (900009).

The spelling of 7872778 in words is "seven million, eight hundred seventy-two thousand, seven hundred seventy-eight".