90155945 has 8 divisors (see below), whose sum is σ = 118022400. Its totient is φ = 65567920.

The previous prime is 90155941. The next prime is 90155951. The reversal of 90155945 is 54955109.

90155945 = T₂₃₂₁ + T₂₃₂₂ + ... + T₂₃₅₃.

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

It is not a de Polignac number, because 90155945 - 2² = 90155941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90155899 and 90155908.

It is not an unprimeable number, because it can be changed into a prime (90155941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 819545 + ... + 819654.

It is an arithmetic number, because the mean of its divisors is an integer number (14752800).

Almost surely, 2^90155945 is an apocalyptic number.

It is an amenable number.

90155945 is a deficient number, since it is larger than the sum of its proper divisors (27866455).

90155945 is a wasteful number, since it uses less digits than its factorization.

90155945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639215.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 90155945 is about 9495.0484464272. The cubic root of 90155945 is about 448.3991596232.

The spelling of 90155945 in words is "ninety million, one hundred fifty-five thousand, nine hundred forty-five".