7227145538 has 18 divisors (see below), whose sum is σ = 11084946291. Its totient is φ = 3533923044.

The previous prime is 7227145517. The next prime is 7227145547. The reversal of 7227145538 is 8355417227.

It can be written as a sum of positive squares in only one way, i.e., 3613572769 + 3613572769 = 60113^2 + 60113^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=60113.

It is a super-3 number, since 3×7227145538³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5649983 + ... + 5651261.

Almost surely, 2^7227145538 is an apocalyptic number.

7227145538 is a deficient number, since it is larger than the sum of its proper divisors (3857800753).

7227145538 is an frugal number, since it uses more digits than its factorization.

7227145538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 1328 counting only the distinct ones).

The product of its digits is 470400, while the sum is 44.

The square root of 7227145538 is about 85012.6198749339. The cubic root of 7227145538 is about 1933.4024599606.

The spelling of 7227145538 in words is "seven billion, two hundred twenty-seven million, one hundred forty-five thousand, five hundred thirty-eight".