187428420 has 36 divisors (see below), whose sum is σ = 568533420. Its totient is φ = 49980864.

The previous prime is 187428401. The next prime is 187428431. The reversal of 187428420 is 24824781.

It can be written as a sum of positive squares in 2 ways, for example, as 20088324 + 167340096 = 4482^2 + 12936^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 520455 + ... + 520814.

It is an arithmetic number, because the mean of its divisors is an integer number (15792595).

Almost surely, 2^187428420 is an apocalyptic number.

187428420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

187428420 is an abundant number, since it is smaller than the sum of its proper divisors (381105000).

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

187428420 is a wasteful number, since it uses less digits than its factorization.

187428420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1041284 (or 1041279 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 187428420 is about 13690.4499560825. The cubic root of 187428420 is about 572.2842776547.

The spelling of 187428420 in words is "one hundred eighty-seven million, four hundred twenty-eight thousand, four hundred twenty".