53709985 has 16 divisors (see below), whose sum is σ = 73872000. Its totient is φ = 36723456.

The previous prime is 53709961. The next prime is 53710003. The reversal of 53709985 is 58990735.

It is not a de Polignac number, because 53709985 - 2²³ = 45321377 is a prime.

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, 11241 + ... + 15289.

It is an arithmetic number, because the mean of its divisors is an integer number (4617000).

Almost surely, 2^53709985 is an apocalyptic number.

It is an amenable number.

53709985 is a deficient number, since it is larger than the sum of its proper divisors (20162015).

53709985 is a wasteful number, since it uses less digits than its factorization.

53709985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4440.

The product of its (nonzero) digits is 340200, while the sum is 46.

The square root of 53709985 is about 7328.7096408577. The cubic root of 53709985 is about 377.2984407095.

It can be divided in two parts, 5370998 and 5, that added together give a triangular number (5371003 = T₃₂₇₇).

The spelling of 53709985 in words is "fifty-three million, seven hundred nine thousand, nine hundred eighty-five".