28401651 has 8 divisors (see below), whose sum is σ = 42076560. Its totient is φ = 18934416.

The previous prime is 28401649. The next prime is 28401683. The reversal of 28401651 is 15610482.

28401651 is a `hidden beast` number, since 2 + 8 + 4 + 0 + 1 + 651 = 666.

It is not a de Polignac number, because 28401651 - 2¹ = 28401649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1051913 = 28401651 / (2 + 8 + 4 + 0 + 1 + 6 + 5 + 1).

It is not an unprimeable number, because it can be changed into a prime (28401601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525930 + ... + 525983.

It is an arithmetic number, because the mean of its divisors is an integer number (5259570).

Almost surely, 2^28401651 is an apocalyptic number.

28401651 is a deficient number, since it is larger than the sum of its proper divisors (13674909).

28401651 is a wasteful number, since it uses less digits than its factorization.

28401651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051922 (or 1051916 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28401651 is about 5329.3199378532. The cubic root of 28401651 is about 305.1039724357.

The spelling of 28401651 in words is "twenty-eight million, four hundred one thousand, six hundred fifty-one".