87921140 has 12 divisors (see below), whose sum is σ = 184634436. Its totient is φ = 35168448.

The previous prime is 87921131. The next prime is 87921143. The reversal of 87921140 is 4112978.

It can be written as a sum of positive squares in 2 ways, for example, as 54789604 + 33131536 = 7402^2 + 5756^2 .

It is a junction number, because it is equal to n+sod(n) for n = 87921097 and 87921106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87921143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2198009 + ... + 2198048.

It is an arithmetic number, because the mean of its divisors is an integer number (15386203).

Almost surely, 2^87921140 is an apocalyptic number.

It is an amenable number.

87921140 is an abundant number, since it is smaller than the sum of its proper divisors (96713296).

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

87921140 is a wasteful number, since it uses less digits than its factorization.

87921140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4396066 (or 4396064 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 87921140 is about 9376.6273254300. The cubic root of 87921140 is about 444.6631124433.

The spelling of 87921140 in words is "eighty-seven million, nine hundred twenty-one thousand, one hundred forty".