84551778 has 48 divisors (see below), whose sum is σ = 198132480. Its totient is φ = 25957248.

The previous prime is 84551777. The next prime is 84551783. The reversal of 84551778 is 87715548.

It is a happy number.

It is a super-2 number, since 2×84551778² = 14298006325922568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84551777) 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, 11443 + ... + 17321.

It is an arithmetic number, because the mean of its divisors is an integer number (4127760).

Almost surely, 2^84551778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84551778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99066240).

84551778 is an abundant number, since it is smaller than the sum of its proper divisors (113580702).

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

84551778 is a wasteful number, since it uses less digits than its factorization.

84551778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951 (or 5948 counting only the distinct ones).

The product of its digits is 313600, while the sum is 45.

The square root of 84551778 is about 9195.2040760388. The cubic root of 84551778 is about 438.9087593584.

The spelling of 84551778 in words is "eighty-four million, five hundred fifty-one thousand, seven hundred seventy-eight".