37728789121 has 3 divisors (see below), whose sum is σ = 37728983361. Its totient is φ = 37728594882.

The previous prime is 37728789107. The next prime is 37728789127. The reversal of 37728789121 is 12198782773.

The square root of 37728789121 is 194239.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 37728789121 - 2⁵ = 37728789089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37728789127) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 97120 + ... + 291358.

It is an arithmetic number, because the mean of its divisors is an integer number (12576327787).

Almost surely, 2^37728789121 is an apocalyptic number.

37728789121 is the 194239-th square number.

37728789121 is the 97120-th centered octagonal number.

It is an amenable number.

37728789121 is a deficient number, since it is larger than the sum of its proper divisors (194240).

37728789121 is an frugal number, since it uses more digits than its factorization.

37728789121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388478 (or 194239 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 55.

The spelling of 37728789121 in words is "thirty-seven billion, seven hundred twenty-eight million, seven hundred eighty-nine thousand, one hundred twenty-one".