87784421 has 6 divisors (see below), whose sum is σ = 90916722. Its totient is φ = 84756560.

The previous prime is 87784409. The next prime is 87784493. The reversal of 87784421 is 12448778.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 21996100 + 65788321 = 4690^2 + 8111^2 .

It is not a de Polignac number, because 87784421 - 2⁶ = 87784357 is a prime.

It is a super-2 number, since 2×87784421² = 15412209140610482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87784121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51350 + ... + 53031.

It is an arithmetic number, because the mean of its divisors is an integer number (15152787).

Almost surely, 2^87784421 is an apocalyptic number.

It is an amenable number.

87784421 is a deficient number, since it is larger than the sum of its proper divisors (3132301).

87784421 is a wasteful number, since it uses less digits than its factorization.

87784421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104439 (or 104410 counting only the distinct ones).

The product of its digits is 100352, while the sum is 41.

The square root of 87784421 is about 9369.3340745221. The cubic root of 87784421 is about 444.4325064131.

The spelling of 87784421 in words is "eighty-seven million, seven hundred eighty-four thousand, four hundred twenty-one".