85408634 has 4 divisors (see below), whose sum is σ = 128112954. Its totient is φ = 42704316.

The previous prime is 85408633. The next prime is 85408639. The reversal of 85408634 is 43680458.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 82864609 + 2544025 = 9103^2 + 1595^2 .

It is not an unprimeable number, because it can be changed into a prime (85408633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21352157 + ... + 21352160.

Almost surely, 2^85408634 is an apocalyptic number.

85408634 is a deficient number, since it is larger than the sum of its proper divisors (42704320).

85408634 is a wasteful number, since it uses less digits than its factorization.

85408634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42704319.

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 85408634 is about 9241.6791764268. The cubic root of 85408634 is about 440.3864270526.

The spelling of 85408634 in words is "eighty-five million, four hundred eight thousand, six hundred thirty-four".