37999728 has 120 divisors (see below), whose sum is σ = 116992512. Its totient is φ = 11441664.

The previous prime is 37999727. The next prime is 37999729. The reversal of 37999728 is 82799973.

It is an interprime number because it is at equal distance from previous prime (37999727) and next prime (37999729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (37999721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99025 + ... + 99407.

Almost surely, 2^37999728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 37999728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58496256).

37999728 is an abundant number, since it is smaller than the sum of its proper divisors (78992784).

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

37999728 is a wasteful number, since it uses less digits than its factorization.

37999728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 454 counting only the distinct ones).

The product of its digits is 1714608, while the sum is 54.

The square root of 37999728 is about 6164.3919408162. The cubic root of 37999728 is about 336.1967385224.

The spelling of 37999728 in words is "thirty-seven million, nine hundred ninety-nine thousand, seven hundred twenty-eight".