87812769 has 32 divisors (see below), whose sum is σ = 136238976. Its totient is φ = 49720320.

The previous prime is 87812759. The next prime is 87812771. The reversal of 87812769 is 96721878.

It is not a de Polignac number, because 87812769 - 2¹⁵ = 87780001 is a prime.

It is a super-2 number, since 2×87812769² = 15422164798894722, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (87812719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87579 + ... + 88575.

It is an arithmetic number, because the mean of its divisors is an integer number (4257468).

Almost surely, 2^87812769 is an apocalyptic number.

It is an amenable number.

87812769 is a deficient number, since it is larger than the sum of its proper divisors (48426207).

87812769 is a wasteful number, since it uses less digits than its factorization.

87812769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1185.

The product of its digits is 338688, while the sum is 48.

The square root of 87812769 is about 9370.8467600319. The cubic root of 87812769 is about 444.4803410844.

The spelling of 87812769 in words is "eighty-seven million, eight hundred twelve thousand, seven hundred sixty-nine".