90109732 has 6 divisors (see below), whose sum is σ = 157692038. Its totient is φ = 45054864.

The previous prime is 90109711. The next prime is 90109739. The reversal of 90109732 is 23790109.

It can be written as a sum of positive squares in only one way, i.e., 59351616 + 30758116 = 7704^2 + 5546^2 .

It is a super-2 number, since 2×90109732² = 16239527602223648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90109694 and 90109703.

It is not an unprimeable number, because it can be changed into a prime (90109739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11263713 + ... + 11263720.

Almost surely, 2^90109732 is an apocalyptic number.

It is an amenable number.

90109732 is a deficient number, since it is larger than the sum of its proper divisors (67582306).

90109732 is a wasteful number, since it uses less digits than its factorization.

90109732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22527437 (or 22527435 counting only the distinct ones).

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 90109732 is about 9492.6146029426. The cubic root of 90109732 is about 448.3225316131.

The spelling of 90109732 in words is "ninety million, one hundred nine thousand, seven hundred thirty-two".