85287780 has 72 divisors (see below), whose sum is σ = 259459200. Its totient is φ = 22677312.

The previous prime is 85287773. The next prime is 85287781. The reversal of 85287780 is 8778258.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (85287781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118261 + ... + 118979.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^85287780 is an apocalyptic number.

It is an amenable number.

85287780 is an abundant number, since it is smaller than the sum of its proper divisors (174171420).

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

85287780 is a wasteful number, since it uses less digits than its factorization.

85287780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1388 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 85287780 is about 9235.1383313949. The cubic root of 85287780 is about 440.1786120580.

The spelling of 85287780 in words is "eighty-five million, two hundred eighty-seven thousand, seven hundred eighty".