7928643 has 12 divisors (see below), whose sum is σ = 11158728. Its totient is φ = 5006880.

The previous prime is 7928623. The next prime is 7928651. The reversal of 7928643 is 3468297.

It is not a de Polignac number, because 7928643 - 2⁹ = 7928131 is a prime.

It is a d-powerful number, because it can be written as 7⁸ + 9² + 2⁷ + 8⁷ + 6³ + 4⁸ + 3⁶ .

It is not an unprimeable number, because it can be changed into a prime (7928623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2578 + ... + 4743.

It is an arithmetic number, because the mean of its divisors is an integer number (929894).

Almost surely, 2^7928643 is an apocalyptic number.

7928643 is a deficient number, since it is larger than the sum of its proper divisors (3230085).

7928643 is a wasteful number, since it uses less digits than its factorization.

7928643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7362 (or 7343 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 7928643 is about 2815.7846153426. The cubic root of 7928643 is about 199.4035815263.

The spelling of 7928643 in words is "seven million, nine hundred twenty-eight thousand, six hundred forty-three".