90819405 has 24 divisors (see below), whose sum is σ = 157691040. Its totient is φ = 48353760.

The previous prime is 90819401. The next prime is 90819499. The reversal of 90819405 is 50491809.

It is not a de Polignac number, because 90819405 - 2² = 90819401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90819405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90819401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31890 + ... + 34620.

It is an arithmetic number, because the mean of its divisors is an integer number (6570460).

Almost surely, 2^90819405 is an apocalyptic number.

It is an amenable number.

90819405 is a deficient number, since it is larger than the sum of its proper divisors (66871635).

90819405 is a wasteful number, since it uses less digits than its factorization.

90819405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3481 (or 3478 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 90819405 is about 9529.9215631609. The cubic root of 90819405 is about 449.4963995879.

The spelling of 90819405 in words is "ninety million, eight hundred nineteen thousand, four hundred five".