87402820 has 24 divisors (see below), whose sum is σ = 185442264. Its totient is φ = 34599936.

The previous prime is 87402817. The next prime is 87402841. The reversal of 87402820 is 2820478.

It can be written as a sum of positive squares in 4 ways, for example, as 12787776 + 74615044 = 3576^2 + 8638^2 .

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, 20587 + ... + 24466.

It is an arithmetic number, because the mean of its divisors is an integer number (7726761).

Almost surely, 2^87402820 is an apocalyptic number.

It is an amenable number.

87402820 is an abundant number, since it is smaller than the sum of its proper divisors (98039444).

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

87402820 is a wasteful number, since it uses less digits than its factorization.

87402820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45159 (or 45157 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 31.

The square root of 87402820 is about 9348.9475343485. The cubic root of 87402820 is about 443.7875847290.

The spelling of 87402820 in words is "eighty-seven million, four hundred two thousand, eight hundred twenty".