90129905 has 8 divisors (see below), whose sum is σ = 108220200. Its totient is φ = 72061056.

The previous prime is 90129899. The next prime is 90129911. The reversal of 90129905 is 50992109.

It is an interprime number because it is at equal distance from previous prime (90129899) and next prime (90129911).

It can be written as a sum of positive squares in 4 ways, for example, as 35724529 + 54405376 = 5977^2 + 7376^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90129905 - 2¹⁴ = 90113521 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6131 + ... + 14759.

It is an arithmetic number, because the mean of its divisors is an integer number (13527525).

Almost surely, 2^90129905 is an apocalyptic number.

It is an amenable number.

90129905 is a deficient number, since it is larger than the sum of its proper divisors (18090295).

90129905 is a wasteful number, since it uses less digits than its factorization.

90129905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10723.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 90129905 is about 9493.6771063693. The cubic root of 90129905 is about 448.3559846613.

The spelling of 90129905 in words is "ninety million, one hundred twenty-nine thousand, nine hundred five".