7649840 has 40 divisors (see below), whose sum is σ = 19405008. Its totient is φ = 2781440.

The previous prime is 7649833. The next prime is 7649849. The reversal of 7649840 is 489467.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 7649794 and 7649803.

It is not an unprimeable number, because it can be changed into a prime (7649849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3467 + ... + 5226.

Almost surely, 2^7649840 is an apocalyptic number.

It is an amenable number.

7649840 is an abundant number, since it is smaller than the sum of its proper divisors (11755168).

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

7649840 is a wasteful number, since it uses less digits than its factorization.

7649840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8717 (or 8711 counting only the distinct ones).

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

The square root of 7649840 is about 2765.8344129756. The cubic root of 7649840 is about 197.0383599191.

The spelling of 7649840 in words is "seven million, six hundred forty-nine thousand, eight hundred forty".