90142738 has 32 divisors (see below), whose sum is σ = 166091904. Its totient is φ = 35811072.

The previous prime is 90142729. The next prime is 90142739. The reversal of 90142738 is 83724109.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (90142739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13120 + ... + 18772.

It is an arithmetic number, because the mean of its divisors is an integer number (5190372).

Almost surely, 2^90142738 is an apocalyptic number.

90142738 is a deficient number, since it is larger than the sum of its proper divisors (75949166).

90142738 is a wasteful number, since it uses less digits than its factorization.

90142738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5746.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 90142738 is about 9494.3529532033. The cubic root of 90142738 is about 448.3772631308.

The spelling of 90142738 in words is "ninety million, one hundred forty-two thousand, seven hundred thirty-eight".