187220064 has 48 divisors (see below), whose sum is σ = 496344240. Its totient is φ = 61785600.

The previous prime is 187220057. The next prime is 187220071. The reversal of 187220064 is 460022781.

It is an interprime number because it is at equal distance from previous prime (187220057) and next prime (187220071).

It is a tau number, because it is divible by the number of its divisors (48).

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, 42 + ... + 19350.

It is an arithmetic number, because the mean of its divisors is an integer number (10340505).

Almost surely, 2^187220064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 187220064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248172120).

187220064 is an abundant number, since it is smaller than the sum of its proper divisors (309124176).

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

187220064 is a wasteful number, since it uses less digits than its factorization.

187220064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19423 (or 19415 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 187220064 is about 13682.8383020483. The cubic root of 187220064 is about 572.0721378692.

The spelling of 187220064 in words is "one hundred eighty-seven million, two hundred twenty thousand, sixty-four".