7621540 has 12 divisors (see below), whose sum is σ = 16005276. Its totient is φ = 3048608.

The previous prime is 7621517. The next prime is 7621541. The reversal of 7621540 is 451267.

It can be written as a sum of positive squares in 2 ways, for example, as 788544 + 6832996 = 888^2 + 2614^2 .

It is not an unprimeable number, because it can be changed into a prime (7621541) 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 3 ways as a sum of consecutive naturals, for example, 190519 + ... + 190558.

It is an arithmetic number, because the mean of its divisors is an integer number (1333773).

Almost surely, 2^7621540 is an apocalyptic number.

It is an amenable number.

7621540 is an abundant number, since it is smaller than the sum of its proper divisors (8383736).

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

7621540 is a wasteful number, since it uses less digits than its factorization.

7621540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381086 (or 381084 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 7621540 is about 2760.7136758454. The cubic root of 7621540 is about 196.7950835465.

The spelling of 7621540 in words is "seven million, six hundred twenty-one thousand, five hundred forty".