1009720090 has 8 divisors (see below), whose sum is σ = 1817496180. Its totient is φ = 403888032.

The previous prime is 1009720081. The next prime is 1009720133. The reversal of 1009720090 is 900279001.

It can be written as a sum of positive squares in 2 ways, for example, as 991683081 + 18037009 = 31491^2 + 4247^2 .

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

It is a super-3 number, since 3×1009720090³ (a number of 28 digits) contains 333 as substring.

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, 50485995 + ... + 50486014.

Almost surely, 2^1009720090 is an apocalyptic number.

1009720090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1009720090 is a deficient number, since it is larger than the sum of its proper divisors (807776090).

1009720090 is a wasteful number, since it uses less digits than its factorization.

1009720090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100972016.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 1009720090 is about 31776.0930575173. The cubic root of 1009720090 is about 1003.2295885295.

Adding to 1009720090 its reverse (900279001), we get a palindrome (1909999091).

The spelling of 1009720090 in words is "one billion, nine million, seven hundred twenty thousand, ninety".