85261780 has 24 divisors (see below), whose sum is σ = 184826880. Its totient is φ = 33004320.

The previous prime is 85261753. The next prime is 85261829. The reversal of 85261780 is 8716258.

It is a super-2 number, since 2×85261780² = 14539142257536800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68140 + ... + 69379.

It is an arithmetic number, because the mean of its divisors is an integer number (7701120).

Almost surely, 2^85261780 is an apocalyptic number.

It is an amenable number.

85261780 is an abundant number, since it is smaller than the sum of its proper divisors (99565100).

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

85261780 is a wasteful number, since it uses less digits than its factorization.

85261780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137559 (or 137557 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 85261780 is about 9233.7305570392. The cubic root of 85261780 is about 440.1338779938.

The spelling of 85261780 in words is "eighty-five million, two hundred sixty-one thousand, seven hundred eighty".