87770920 has 32 divisors (see below), whose sum is σ = 203857920. Its totient is φ = 33975360.

The previous prime is 87770857. The next prime is 87770927. The reversal of 87770920 is 2907778.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (87770927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34152 + ... + 36631.

It is an arithmetic number, because the mean of its divisors is an integer number (6370560).

Almost surely, 2^87770920 is an apocalyptic number.

It is an amenable number.

87770920 is an abundant number, since it is smaller than the sum of its proper divisors (116087000).

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

87770920 is a wasteful number, since it uses less digits than its factorization.

87770920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70825 (or 70821 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 87770920 is about 9368.6135580458. The cubic root of 87770920 is about 444.4097210835.

The spelling of 87770920 in words is "eighty-seven million, seven hundred seventy thousand, nine hundred twenty".