7978744 has 8 divisors (see below), whose sum is σ = 14960160. Its totient is φ = 3989368.

The previous prime is 7978721. The next prime is 7978753. The reversal of 7978744 is 4478797.

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 7² + 9⁷ + 7⁵ + 8⁷ + 7⁵ + 4⁷ + 4¹⁰ .

It is a junction number, because it is equal to n+sod(n) for n = 7978694 and 7978703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498664 + ... + 498679.

It is an arithmetic number, because the mean of its divisors is an integer number (1870020).

Almost surely, 2^7978744 is an apocalyptic number.

It is an amenable number.

7978744 is a deficient number, since it is larger than the sum of its proper divisors (6981416).

7978744 is a wasteful number, since it uses less digits than its factorization.

7978744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997349 (or 997345 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 7978744 is about 2824.6670600267. The cubic root of 7978744 is about 199.8227095536.

The spelling of 7978744 in words is "seven million, nine hundred seventy-eight thousand, seven hundred forty-four".