4012728372538 has 4 divisors (see below), whose sum is σ = 6019092558810. Its totient is φ = 2006364186268.

The previous prime is 4012728372473. The next prime is 4012728372539. The reversal of 4012728372538 is 8352738272104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3231807984729 + 780920387809 = 1797723^2 + 883697^2 .

It is a super-2 number, since 2×4012728372538² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4012728372539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1003182093133 + ... + 1003182093136.

Almost surely, 2^{4012728372538} is an apocalyptic number.

4012728372538 is a deficient number, since it is larger than the sum of its proper divisors (2006364186272).

4012728372538 is a wasteful number, since it uses less digits than its factorization.

4012728372538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006364186271.

The product of its (nonzero) digits is 4515840, while the sum is 52.

The spelling of 4012728372538 in words is "four trillion, twelve billion, seven hundred twenty-eight million, three hundred seventy-two thousand, five hundred thirty-eight".