87390420 has 96 divisors (see below), whose sum is σ = 265399680. Its totient is φ = 21358080.

The previous prime is 87390389. The next prime is 87390449. The reversal of 87390420 is 2409378.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140871 + ... + 141489.

It is an arithmetic number, because the mean of its divisors is an integer number (2764580).

Almost surely, 2^87390420 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 87390420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132699840).

87390420 is an abundant number, since it is smaller than the sum of its proper divisors (178009260).

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

87390420 is a wasteful number, since it uses less digits than its factorization.

87390420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 87390420 is about 9348.2843345718. The cubic root of 87390420 is about 443.7665967475.

Adding to 87390420 its reverse (2409378), we get a palindrome (89799798).

The spelling of 87390420 in words is "eighty-seven million, three hundred ninety thousand, four hundred twenty".