90061778 has 8 divisors (see below), whose sum is σ = 135229068. Its totient is φ = 44985424.

The previous prime is 90061759. The next prime is 90061819. The reversal of 90061778 is 87716009.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65983129 + 24078649 = 8123^2 + 4907^2 .

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

It is a super-2 number, since 2×90061778² = 16222247713042568, which contains 22 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, 20201 + ... + 24252.

Almost surely, 2^90061778 is an apocalyptic number.

90061778 is a deficient number, since it is larger than the sum of its proper divisors (45167290).

90061778 is a wasteful number, since it uses less digits than its factorization.

90061778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45468.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 90061778 is about 9490.0884084396. The cubic root of 90061778 is about 448.2429890634.

The spelling of 90061778 in words is "ninety million, sixty-one thousand, seven hundred seventy-eight".