7878537 has 6 divisors (see below), whose sum is σ = 11380122. Its totient is φ = 5252352.

The previous prime is 7878527. The next prime is 7878551. The reversal of 7878537 is 7358787.

7878537 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4562496 + 3316041 = 2136^2 + 1821^2 .

It is not a de Polignac number, because 7878537 - 2¹⁸ = 7616393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7878492 and 7878501.

It is not an unprimeable number, because it can be changed into a prime (7878527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 437688 + ... + 437705.

It is an arithmetic number, because the mean of its divisors is an integer number (1896687).

Almost surely, 2^7878537 is an apocalyptic number.

It is an amenable number.

7878537 is a deficient number, since it is larger than the sum of its proper divisors (3501585).

7878537 is a wasteful number, since it uses less digits than its factorization.

7878537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875399 (or 875396 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 7878537 is about 2806.8731713421. The cubic root of 7878537 is about 198.9826420219.

The spelling of 7878537 in words is "seven million, eight hundred seventy-eight thousand, five hundred thirty-seven".