7537221684 has 36 divisors (see below), whose sum is σ = 19709404260. Its totient is φ = 2425772160.

The previous prime is 7537221683. The next prime is 7537221709. The reversal of 7537221684 is 4861227357.

7537221684 is a `hidden beast` number, since 7 + 537 + 22 + 16 + 84 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3763822500 + 3773399184 = 61350^2 + 61428^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7537221683) 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 11 ways as a sum of consecutive naturals, for example, 3608737 + ... + 3610824.

Almost surely, 2^7537221684 is an apocalyptic number.

It is an amenable number.

7537221684 is an abundant number, since it is smaller than the sum of its proper divisors (12172182576).

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

7537221684 is a wasteful number, since it uses less digits than its factorization.

7537221684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219600 (or 7219595 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 7537221684 is about 86817.1739000988. The cubic root of 7537221684 is about 1960.6666554264. Note that the first 4 decimals are identical.

The spelling of 7537221684 in words is "seven billion, five hundred thirty-seven million, two hundred twenty-one thousand, six hundred eighty-four".