87812772 has 12 divisors (see below), whose sum is σ = 204896496. Its totient is φ = 29270920.

The previous prime is 87812771. The next prime is 87812773. The reversal of 87812772 is 27721878.

It is an interprime number because it is at equal distance from previous prime (87812771) and next prime (87812773).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×87812772² = 15422165852647968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87812771) 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, 3658854 + ... + 3658877.

It is an arithmetic number, because the mean of its divisors is an integer number (17074708).

Almost surely, 2^87812772 is an apocalyptic number.

It is an amenable number.

87812772 is an abundant number, since it is smaller than the sum of its proper divisors (117083724).

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

87812772 is a wasteful number, since it uses less digits than its factorization.

87812772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317738 (or 7317736 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The square root of 87812772 is about 9370.8469201028. The cubic root of 87812772 is about 444.4803461461.

The spelling of 87812772 in words is "eighty-seven million, eight hundred twelve thousand, seven hundred seventy-two".