7224743781 has 16 divisors (see below), whose sum is σ = 11048593920. Its totient is φ = 4661124480.

The previous prime is 7224743723. The next prime is 7224743819. The reversal of 7224743781 is 1873474227.

7224743781 is a `hidden beast` number, since 72 + 2 + 474 + 37 + 81 = 666.

It is not a de Polignac number, because 7224743781 - 2⁶ = 7224743717 is a prime.

It is a super-2 number, since 2×7224743781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7224743081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4315020 + ... + 4316693.

It is an arithmetic number, because the mean of its divisors is an integer number (690537120).

Almost surely, 2^7224743781 is an apocalyptic number.

It is an amenable number.

7224743781 is a deficient number, since it is larger than the sum of its proper divisors (3823850139).

7224743781 is a wasteful number, since it uses less digits than its factorization.

7224743781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8631753 (or 8631747 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 7224743781 is about 84998.4928160494. The cubic root of 7224743781 is about 1933.1882639431.

The spelling of 7224743781 in words is "seven billion, two hundred twenty-four million, seven hundred forty-three thousand, seven hundred eighty-one".