90138281937402 has 8 divisors (see below), whose sum is σ = 180276563874816. Its totient is φ = 30046093979132.

The previous prime is 90138281937377. The next prime is 90138281937413. The reversal of 90138281937402 is 20473918283109.

It is a happy number.

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

90138281937402 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7511523494778 + ... + 7511523494789.

It is an arithmetic number, because the mean of its divisors is an integer number (22534570484352).

Almost surely, 2^{90138281937402} is an apocalyptic number.

90138281937402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90138281937402 is a wasteful number, since it uses less digits than its factorization.

90138281937402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15023046989572.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 90138281937402 in words is "ninety trillion, one hundred thirty-eight billion, two hundred eighty-one million, nine hundred thirty-seven thousand, four hundred two".