65428805 has 16 divisors (see below), whose sum is σ = 85718640. Its totient is φ = 47651328.

The previous prime is 65428789. The next prime is 65428807. The reversal of 65428805 is 50882456.

It can be written as a sum of positive squares in 8 ways, for example, as 368449 + 65060356 = 607^2 + 8066^2 .

It is a cyclic number.

It is not a de Polignac number, because 65428805 - 2⁴ = 65428789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65428807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2150 + ... + 11639.

It is an arithmetic number, because the mean of its divisors is an integer number (5357415).

Almost surely, 2^65428805 is an apocalyptic number.

65428805 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65428805 is a deficient number, since it is larger than the sum of its proper divisors (20289835).

65428805 is a wasteful number, since it uses less digits than its factorization.

65428805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880.

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 65428805 is about 8088.8073904625. The cubic root of 65428805 is about 402.9547962852.

The spelling of 65428805 in words is "sixty-five million, four hundred twenty-eight thousand, eight hundred five".