90129236 has 24 divisors (see below), whose sum is σ = 166464480. Its totient is φ = 42580512.

The previous prime is 90129229. The next prime is 90129239. The reversal of 90129236 is 63292109.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90129239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32330 + ... + 35006.

It is an arithmetic number, because the mean of its divisors is an integer number (6936020).

Almost surely, 2^90129236 is an apocalyptic number.

It is an amenable number.

90129236 is a deficient number, since it is larger than the sum of its proper divisors (76335244).

90129236 is a wasteful number, since it uses less digits than its factorization.

90129236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143 (or 3141 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 90129236 is about 9493.6418723270. The cubic root of 90129236 is about 448.3548753332.

The spelling of 90129236 in words is "ninety million, one hundred twenty-nine thousand, two hundred thirty-six".