72017090 has 8 divisors (see below), whose sum is σ = 129630780. Its totient is φ = 28806832.

The previous prime is 72017081. The next prime is 72017107. The reversal of 72017090 is 9071027.

It can be written as a sum of positive squares in 2 ways, for example, as 64818601 + 7198489 = 8051^2 + 2683^2 .

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

It is a super-2 number, since 2×72017090² = 10372922504136200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3600845 + ... + 3600864.

Almost surely, 2^72017090 is an apocalyptic number.

72017090 is a deficient number, since it is larger than the sum of its proper divisors (57613690).

72017090 is a wasteful number, since it uses less digits than its factorization.

72017090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7201716.

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 72017090 is about 8486.2883523953. The cubic root of 72017090 is about 416.0496774069.

The spelling of 72017090 in words is "seventy-two million, seventeen thousand, ninety".