28072737 has 60 divisors (see below), whose sum is σ = 53300016. Its totient is φ = 14560560.

The previous prime is 28072727. The next prime is 28072757. The reversal of 28072737 is 73727082.

It is not a de Polignac number, because 28072737 - 2⁴ = 28072721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28072717) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 43338 + ... + 43980.

Almost surely, 2^28072737 is an apocalyptic number.

28072737 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28072737 is a deficient number, since it is larger than the sum of its proper divisors (25227279).

28072737 is a wasteful number, since it uses less digits than its factorization.

28072737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 664 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 28072737 is about 5298.3711648015. The cubic root of 28072737 is about 303.9216131287.

The spelling of 28072737 in words is "twenty-eight million, seventy-two thousand, seven hundred thirty-seven".