228761990 has 8 divisors (see below), whose sum is σ = 411771600. Its totient is φ = 91504792.

The previous prime is 228761969. The next prime is 228761993. The reversal of 228761990 is 99167822.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228761993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11438090 + ... + 11438109.

It is an arithmetic number, because the mean of its divisors is an integer number (51471450).

Almost surely, 2^228761990 is an apocalyptic number.

228761990 is a deficient number, since it is larger than the sum of its proper divisors (183009610).

228761990 is a wasteful number, since it uses less digits than its factorization.

228761990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22876206.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 228761990 is about 15124.8798342334. The cubic root of 228761990 is about 611.5912855535.

The spelling of 228761990 in words is "two hundred twenty-eight million, seven hundred sixty-one thousand, nine hundred ninety".