208115428 has 24 divisors (see below), whose sum is σ = 389243232. Its totient is φ = 97017984.

The previous prime is 208115423. The next prime is 208115437. The reversal of 208115428 is 824511802.

It is a self number, because there is not a number n which added to its sum of digits gives 208115428.

It is not an unprimeable number, because it can be changed into a prime (208115423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7026 + ... + 21577.

It is an arithmetic number, because the mean of its divisors is an integer number (16218468).

Almost surely, 2^208115428 is an apocalyptic number.

It is an amenable number.

208115428 is a deficient number, since it is larger than the sum of its proper divisors (181127804).

208115428 is a wasteful number, since it uses less digits than its factorization.

208115428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28731 (or 28729 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 208115428 is about 14426.2062927160. The cubic root of 208115428 is about 592.6087943740.

The spelling of 208115428 in words is "two hundred eight million, one hundred fifteen thousand, four hundred twenty-eight".