7878722 has 4 divisors (see below), whose sum is σ = 11818086. Its totient is φ = 3939360.

The previous prime is 7878721. The next prime is 7878763. The reversal of 7878722 is 2278787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2278787 = 7 ⋅325541.

It can be written as a sum of positive squares in only one way, i.e., 7123561 + 755161 = 2669^2 + 869^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7878722.

It is not an unprimeable number, because it can be changed into a prime (7878721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1969679 + ... + 1969682.

Almost surely, 2^7878722 is an apocalyptic number.

7878722 is a deficient number, since it is larger than the sum of its proper divisors (3939364).

7878722 is a wasteful number, since it uses less digits than its factorization.

7878722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939363.

The product of its digits is 87808, while the sum is 41.

The square root of 7878722 is about 2806.9061259686. The cubic root of 7878722 is about 198.9841994812.

The spelling of 7878722 in words is "seven million, eight hundred seventy-eight thousand, seven hundred twenty-two".