87644419 has 2 divisors, whose sum is σ = 87644420. Its totient is φ = 87644418.

The previous prime is 87644413. The next prime is 87644437. The reversal of 87644419 is 91444678.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87644419 - 2³ = 87644411 is a prime.

It is a super-2 number, since 2×87644419² = 15363088363695122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87644411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43822209 + 43822210.

It is an arithmetic number, because the mean of its divisors is an integer number (43822210).

Almost surely, 2^87644419 is an apocalyptic number.

87644419 is a deficient number, since it is larger than the sum of its proper divisors (1).

87644419 is an equidigital number, since it uses as much as digits as its factorization.

87644419 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 87644419 is about 9361.8598045474. The cubic root of 87644419 is about 444.1961146323.

The spelling of 87644419 in words is "eighty-seven million, six hundred forty-four thousand, four hundred nineteen".