7478778 has 16 divisors (see below), whose sum is σ = 14984640. Its totient is φ = 2488416.

The previous prime is 7478771. The next prime is 7478791. The reversal of 7478778 is 8778747.

7478778 is a nontrivial binomial coefficient, being equal to C(3868, 2).

It is not an unprimeable number, because it can be changed into a prime (7478771) 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, 5158 + ... + 6446.

It is an arithmetic number, because the mean of its divisors is an integer number (936540).

Almost surely, 2^7478778 is an apocalyptic number.

7478778 is the 3867-th triangular number and also the 1934-th hexagonal number.

7478778 is an abundant number, since it is smaller than the sum of its proper divisors (7505862).

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

7478778 is a wasteful number, since it uses less digits than its factorization.

7478778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2261.

The product of its digits is 614656, while the sum is 48.

The square root of 7478778 is about 2734.7354533848. The cubic root of 7478778 is about 195.5585824878.

It can be divided in two parts, 7478 and 778, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 7478778 in words is "seven million, four hundred seventy-eight thousand, seven hundred seventy-eight".