90230729 has 4 divisors (see below), whose sum is σ = 90283284. Its totient is φ = 90178176.

The previous prime is 90230671. The next prime is 90230731. The reversal of 90230729 is 92703209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92703209 = 71 ⋅1305679.

It can be written as a sum of positive squares in 2 ways, for example, as 62647225 + 27583504 = 7915^2 + 5252^2 .

It is a cyclic number.

It is not a de Polignac number, because 90230729 - 2¹⁶ = 90165193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90230695 and 90230704.

It is not an unprimeable number, because it can be changed into a prime (90230029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23612 + ... + 27165.

It is an arithmetic number, because the mean of its divisors is an integer number (22570821).

Almost surely, 2^90230729 is an apocalyptic number.

It is an amenable number.

90230729 is a deficient number, since it is larger than the sum of its proper divisors (52555).

90230729 is a wasteful number, since it uses less digits than its factorization.

90230729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52554.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 90230729 is about 9498.9856826927. The cubic root of 90230729 is about 448.5231071350.

The spelling of 90230729 in words is "ninety million, two hundred thirty thousand, seven hundred twenty-nine".