28994425 has 6 divisors (see below), whose sum is σ = 35953118. Its totient is φ = 23195520.

The previous prime is 28994417. The next prime is 28994431. The reversal of 28994425 is 52449982.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 553536 + 28440889 = 744^2 + 5333^2 .

It is not a de Polignac number, because 28994425 - 2³ = 28994417 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 579864 + ... + 579913.

Almost surely, 2^28994425 is an apocalyptic number.

28994425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28994425 is a deficient number, since it is larger than the sum of its proper divisors (6958693).

28994425 is a wasteful number, since it uses less digits than its factorization.

28994425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159787 (or 1159782 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 28994425 is about 5384.6471564997. The cubic root of 28994425 is about 307.2119937594.

The spelling of 28994425 in words is "twenty-eight million, nine hundred ninety-four thousand, four hundred twenty-five".