7402281138 has 54 divisors (see below), whose sum is σ = 18663212061. Its totient is φ = 2114207424.

The previous prime is 7402281137. The next prime is 7402281143. The reversal of 7402281138 is 8311822047.

It can be written as a sum of positive squares in 2 ways, for example, as 6047084169 + 1355196969 = 77763^2 + 36813^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=60837.

It is not an unprimeable number, because it can be changed into a prime (7402281137) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2553706 + ... + 2556602.

Almost surely, 2^7402281138 is an apocalyptic number.

7402281138 is an abundant number, since it is smaller than the sum of its proper divisors (11260930923).

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

7402281138 is an equidigital number, since it uses as much as digits as its factorization.

7402281138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 2909 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 7402281138 is about 86036.5104940920. The cubic root of 7402281138 is about 1948.8953759554.

The spelling of 7402281138 in words is "seven billion, four hundred two million, two hundred eighty-one thousand, one hundred thirty-eight".