75639985 has 16 divisors (see below), whose sum is σ = 96137856. Its totient is φ = 57011328.

The previous prime is 75639973. The next prime is 75639989. The reversal of 75639985 is 58993657.

It is a cyclic number.

It is not a de Polignac number, because 75639985 - 2⁷ = 75639857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75639989) 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, 2797 + ... + 12613.

It is an arithmetic number, because the mean of its divisors is an integer number (6008616).

Almost surely, 2^75639985 is an apocalyptic number.

It is an amenable number.

75639985 is a deficient number, since it is larger than the sum of its proper divisors (20497871).

75639985 is a wasteful number, since it uses less digits than its factorization.

75639985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9912.

The product of its digits is 2041200, while the sum is 52.

The square root of 75639985 is about 8697.1250997097. The cubic root of 75639985 is about 422.9124574094.

The spelling of 75639985 in words is "seventy-five million, six hundred thirty-nine thousand, nine hundred eighty-five".