90144487 has 4 divisors (see below), whose sum is σ = 90262480. Its totient is φ = 90026496.

The previous prime is 90144479. The next prime is 90144491. The reversal of 90144487 is 78444109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78444109 = 61 ⋅1285969.

It is a cyclic number.

It is not a de Polignac number, because 90144487 - 2³ = 90144479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90144427) 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, 57843 + ... + 59380.

It is an arithmetic number, because the mean of its divisors is an integer number (22565620).

Almost surely, 2^90144487 is an apocalyptic number.

90144487 is a deficient number, since it is larger than the sum of its proper divisors (117993).

90144487 is a wasteful number, since it uses less digits than its factorization.

90144487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117992.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 90144487 is about 9494.4450601391. The cubic root of 90144487 is about 448.3801630011.

The spelling of 90144487 in words is "ninety million, one hundred forty-four thousand, four hundred eighty-seven".