53309785 has 16 divisors (see below), whose sum is σ = 66952656. Its totient is φ = 40704768.

The previous prime is 53309779. The next prime is 53309803. The reversal of 53309785 is 58790335.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4756761 + 48553024 = 2181^2 + 6968^2 .

It is a cyclic number.

It is not a de Polignac number, because 53309785 - 2⁷ = 53309657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7087 + ... + 12523.

It is an arithmetic number, because the mean of its divisors is an integer number (4184541).

Almost surely, 2^53309785 is an apocalyptic number.

It is an amenable number.

53309785 is a deficient number, since it is larger than the sum of its proper divisors (13642871).

53309785 is a wasteful number, since it uses less digits than its factorization.

53309785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 53309785 is about 7301.3550112291. The cubic root of 53309785 is about 376.3590038216.

The spelling of 53309785 in words is "fifty-three million, three hundred nine thousand, seven hundred eighty-five".