28653421 has 8 divisors (see below), whose sum is σ = 30085920. Its totient is φ = 27250608.

The previous prime is 28653419. The next prime is 28653431. The reversal of 28653421 is 12435682.

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

It is a cyclic number.

It is not a de Polignac number, because 28653421 - 2¹ = 28653419 is a prime.

It is a super-5 number, since 5×28653421⁵ (a number of 38 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28653431) 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, 5431 + ... + 9316.

It is an arithmetic number, because the mean of its divisors is an integer number (3760740).

Almost surely, 2^28653421 is an apocalyptic number.

It is an amenable number.

28653421 is a deficient number, since it is larger than the sum of its proper divisors (1432499).

28653421 is a wasteful number, since it uses less digits than its factorization.

28653421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14843.

The product of its digits is 11520, while the sum is 31.

The square root of 28653421 is about 5352.8890330363. The cubic root of 28653421 is about 306.0028656801.

The spelling of 28653421 in words is "twenty-eight million, six hundred fifty-three thousand, four hundred twenty-one".