28990455 has 16 divisors (see below), whose sum is σ = 49953120. Its totient is φ = 14272128.

The previous prime is 28990439. The next prime is 28990463. The reversal of 28990455 is 55409982.

It is not a de Polignac number, because 28990455 - 2⁴ = 28990439 is a prime.

It is a super-2 number, since 2×28990455² = 1680892962214050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74140 + ... + 74529.

It is an arithmetic number, because the mean of its divisors is an integer number (3122070).

Almost surely, 2^28990455 is an apocalyptic number.

28990455 is a deficient number, since it is larger than the sum of its proper divisors (20962665).

28990455 is a wasteful number, since it uses less digits than its factorization.

28990455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148690.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 28990455 is about 5384.2785031980. The cubic root of 28990455 is about 307.1979716697.

The spelling of 28990455 in words is "twenty-eight million, nine hundred ninety thousand, four hundred fifty-five".