90078649 has 12 divisors (see below), whose sum is σ = 96195456. Its totient is φ = 84305672.

The previous prime is 90078647. The next prime is 90078661. The reversal of 90078649 is 94687009.

It is not a de Polignac number, because 90078649 - 2¹ = 90078647 is a prime.

It is a super-2 number, since 2×90078649² = 16228326011330402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90078647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23052 + ... + 26674.

It is an arithmetic number, because the mean of its divisors is an integer number (8016288).

Almost surely, 2^90078649 is an apocalyptic number.

It is an amenable number.

90078649 is a deficient number, since it is larger than the sum of its proper divisors (6116807).

90078649 is a wasteful number, since it uses less digits than its factorization.

90078649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716 (or 3693 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 90078649 is about 9490.9772415700. The cubic root of 90078649 is about 448.2709766495.

The spelling of 90078649 in words is "ninety million, seventy-eight thousand, six hundred forty-nine".