4978640 has 20 divisors (see below), whose sum is σ = 11575524. Its totient is φ = 1991424.

The previous prime is 4978607. The next prime is 4978651. The reversal of 4978640 is 468794.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3519376 + 1459264 = 1876^2 + 1208^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 4978594 and 4978603.

It is a congruent number.

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, 31037 + ... + 31196.

Almost surely, 2^4978640 is an apocalyptic number.

4978640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4978640 is an abundant number, since it is smaller than the sum of its proper divisors (6596884).

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

4978640 is a wasteful number, since it uses less digits than its factorization.

4978640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62246 (or 62240 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 4978640 is about 2231.2866243493. The cubic root of 4978640 is about 170.7537465228.

The spelling of 4978640 in words is "four million, nine hundred seventy-eight thousand, six hundred forty".