32028781 has 2 divisors, whose sum is σ = 32028782. Its totient is φ = 32028780.

The previous prime is 32028757. The next prime is 32028793. The reversal of 32028781 is 18782023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 13616100 = 4291^2 + 3690^2 .

It is a cyclic number.

It is not a de Polignac number, because 32028781 - 2¹³ = 32020589 is a prime.

It is a super-2 number, since 2×32028781² = 2051685624691922, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32028751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16014390 + 16014391.

It is an arithmetic number, because the mean of its divisors is an integer number (16014391).

Almost surely, 2^32028781 is an apocalyptic number.

It is an amenable number.

32028781 is a deficient number, since it is larger than the sum of its proper divisors (1).

32028781 is an equidigital number, since it uses as much as digits as its factorization.

32028781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 32028781 is about 5659.3975827821. The cubic root of 32028781 is about 317.5753631009.

The spelling of 32028781 in words is "thirty-two million, twenty-eight thousand, seven hundred eighty-one".