85401640 has 32 divisors (see below), whose sum is σ = 194866560. Its totient is φ = 33678400.

The previous prime is 85401611. The next prime is 85401649. The reversal of 85401640 is 4610458.

It is a super-2 number, since 2×85401640² = 14586880229379200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85401599 and 85401608.

It is not an unprimeable number, because it can be changed into a prime (85401649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12196 + ... + 17875.

It is an arithmetic number, because the mean of its divisors is an integer number (6089580).

Almost surely, 2^85401640 is an apocalyptic number.

It is an amenable number.

85401640 is an abundant number, since it is smaller than the sum of its proper divisors (109464920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85401640 is a wasteful number, since it uses less digits than its factorization.

85401640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30153 (or 30149 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 85401640 is about 9241.3007742417. The cubic root of 85401640 is about 440.3744058372.

The spelling of 85401640 in words is "eighty-five million, four hundred one thousand, six hundred forty".