208624428 has 18 divisors (see below), whose sum is σ = 527356284. Its totient is φ = 69541464.

The previous prime is 208624417. The next prime is 208624439. The reversal of 208624428 is 824426802.

It is a happy number.

208624428 is a `hidden beast` number, since 2 + 0 + 8 + 624 + 4 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (208624417) and next prime (208624439).

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 5795123 = 208624428 / (2 + 0 + 8 + 6 + 2 + 4 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 208624392 and 208624401.

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, 2897526 + ... + 2897597.

Almost surely, 2^208624428 is an apocalyptic number.

It is an amenable number.

208624428 is an abundant number, since it is smaller than the sum of its proper divisors (318731856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208624428 is a wasteful number, since it uses less digits than its factorization.

208624428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5795133 (or 5795128 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 36.

The square root of 208624428 is about 14443.8370248352. The cubic root of 208624428 is about 593.0915269641.

The spelling of 208624428 in words is "two hundred eight million, six hundred twenty-four thousand, four hundred twenty-eight".