87051220 has 24 divisors (see below), whose sum is σ = 193561704. Its totient is φ = 32772096.

The previous prime is 87051199. The next prime is 87051253. The reversal of 87051220 is 2215078.

It can be written as a sum of positive squares in 4 ways, for example, as 1192464 + 85858756 = 1092^2 + 9266^2 .

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, 127677 + ... + 128356.

It is an arithmetic number, because the mean of its divisors is an integer number (8065071).

Almost surely, 2^87051220 is an apocalyptic number.

It is an amenable number.

87051220 is an abundant number, since it is smaller than the sum of its proper divisors (106510484).

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

87051220 is a wasteful number, since it uses less digits than its factorization.

87051220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256059 (or 256057 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 87051220 is about 9330.1243292895. The cubic root of 87051220 is about 443.1917022974.

Adding to 87051220 its reverse (2215078), we get a palindrome (89266298).

The spelling of 87051220 in words is "eighty-seven million, fifty-one thousand, two hundred twenty".