28381651 has 2 divisors, whose sum is σ = 28381652. Its totient is φ = 28381650.

The previous prime is 28381631. The next prime is 28381663. The reversal of 28381651 is 15618382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28381651 - 2⁹ = 28381139 is a prime.

It is a super-2 number, since 2×28381651² = 1611036226971602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28381621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190825 + 14190826.

It is an arithmetic number, because the mean of its divisors is an integer number (14190826).

Almost surely, 2^28381651 is an apocalyptic number.

28381651 is a deficient number, since it is larger than the sum of its proper divisors (1).

28381651 is an equidigital number, since it uses as much as digits as its factorization.

28381651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 34.

The square root of 28381651 is about 5327.4431953799. The cubic root of 28381651 is about 305.0323391312.

It can be divided in two parts, 2838 and 1651, that added together give a square (4489 = 67²).

The spelling of 28381651 in words is "twenty-eight million, three hundred eighty-one thousand, six hundred fifty-one".