85421720 has 32 divisors (see below), whose sum is σ = 202316400. Its totient is φ = 32370048.

The previous prime is 85421681. The next prime is 85421723. The reversal of 85421720 is 2712458.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85421723) 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, 55439 + ... + 56958.

Almost surely, 2^85421720 is an apocalyptic number.

It is an amenable number.

85421720 is an abundant number, since it is smaller than the sum of its proper divisors (116894680).

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

85421720 is a wasteful number, since it uses less digits than its factorization.

85421720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112427 (or 112423 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 85421720 is about 9242.3871375311. The cubic root of 85421720 is about 440.4089173724.

The spelling of 85421720 in words is "eighty-five million, four hundred twenty-one thousand, seven hundred twenty".