87819890 has 16 divisors (see below), whose sum is σ = 158906880. Its totient is φ = 34943280.

The previous prime is 87819839. The next prime is 87819899. The reversal of 87819890 is 9891878.

It is a happy number.

It is a super-2 number, since 2×87819890² = 15424666159224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87819899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21080 + ... + 24899.

It is an arithmetic number, because the mean of its divisors is an integer number (9931680).

Almost surely, 2^87819890 is an apocalyptic number.

87819890 is a deficient number, since it is larger than the sum of its proper divisors (71086990).

87819890 is a wasteful number, since it uses less digits than its factorization.

87819890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46177.

The product of its (nonzero) digits is 290304, while the sum is 50.

The square root of 87819890 is about 9371.2267073207. The cubic root of 87819890 is about 444.4923555063.

The spelling of 87819890 in words is "eighty-seven million, eight hundred nineteen thousand, eight hundred ninety".