7442640 has 60 divisors (see below), whose sum is σ = 24997284. Its totient is φ = 1984512.

The previous prime is 7442627. The next prime is 7442653. The reversal of 7442640 is 462447.

It is an interprime number because it is at equal distance from previous prime (7442627) and next prime (7442653).

It can be written as a sum of positive squares in 2 ways, for example, as 1272384 + 6170256 = 1128^2 + 2484^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4449 + ... + 5888.

Almost surely, 2^7442640 is an apocalyptic number.

It is an amenable number.

7442640 is an abundant number, since it is smaller than the sum of its proper divisors (17554644).

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

7442640 is a wasteful number, since it uses less digits than its factorization.

7442640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10356 (or 10347 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 7442640 is about 2728.1202319546. The cubic root of 7442640 is about 195.2430893409.

The spelling of 7442640 in words is "seven million, four hundred forty-two thousand, six hundred forty".