756545138 has 4 divisors (see below), whose sum is σ = 1134817710. Its totient is φ = 378272568.

The previous prime is 756545113. The next prime is 756545147. The reversal of 756545138 is 831545657.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831545657 = 23 ⋅36154159.

It can be written as a sum of positive squares in only one way, i.e., 588402049 + 168143089 = 24257^2 + 12967^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189136283 + ... + 189136286.

Almost surely, 2^756545138 is an apocalyptic number.

756545138 is a deficient number, since it is larger than the sum of its proper divisors (378272572).

756545138 is a wasteful number, since it uses less digits than its factorization.

756545138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378272571.

The product of its digits is 504000, while the sum is 44.

The square root of 756545138 is about 27505.3656220018. The cubic root of 756545138 is about 911.1956019218.

The spelling of 756545138 in words is "seven hundred fifty-six million, five hundred forty-five thousand, one hundred thirty-eight".