87611820 has 48 divisors (see below), whose sum is σ = 245760480. Its totient is φ = 23320576.

The previous prime is 87611791. The next prime is 87611827. The reversal of 87611820 is 2811678.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (87611827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45436 + ... + 47324.

It is an arithmetic number, because the mean of its divisors is an integer number (5120010).

Almost surely, 2^87611820 is an apocalyptic number.

It is an amenable number.

87611820 is an abundant number, since it is smaller than the sum of its proper divisors (158148660).

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

87611820 is a wasteful number, since it uses less digits than its factorization.

87611820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2674 (or 2672 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 87611820 is about 9360.1185889923. The cubic root of 87611820 is about 444.1410354652.

The spelling of 87611820 in words is "eighty-seven million, six hundred eleven thousand, eight hundred twenty".