90781142 has 4 divisors (see below), whose sum is σ = 136171716. Its totient is φ = 45390570.

The previous prime is 90781109. The next prime is 90781147. The reversal of 90781142 is 24118709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24118709 = 37 ⋅651857.

It is a junction number, because it is equal to n+sod(n) for n = 90781099 and 90781108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90781147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22695284 + ... + 22695287.

It is an arithmetic number, because the mean of its divisors is an integer number (34042929).

Almost surely, 2^90781142 is an apocalyptic number.

90781142 is a deficient number, since it is larger than the sum of its proper divisors (45390574).

90781142 is a wasteful number, since it uses less digits than its factorization.

90781142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45390573.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 90781142 is about 9527.9138325239. The cubic root of 90781142 is about 449.4332651485.

The spelling of 90781142 in words is "ninety million, seven hundred eighty-one thousand, one hundred forty-two".