28651998 has 16 divisors (see below), whose sum is σ = 59152896. Its totient is φ = 9242520.

The previous prime is 28651991. The next prime is 28652011. The reversal of 28651998 is 89915682.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28651991) 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, 76836 + ... + 77207.

It is an arithmetic number, because the mean of its divisors is an integer number (3697056).

Almost surely, 2^28651998 is an apocalyptic number.

28651998 is an abundant number, since it is smaller than the sum of its proper divisors (30500898).

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

28651998 is a wasteful number, since it uses less digits than its factorization.

28651998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154079.

The product of its digits is 311040, while the sum is 48.

The square root of 28651998 is about 5352.7561125088. The cubic root of 28651998 is about 305.9977999756.

The spelling of 28651998 in words is "twenty-eight million, six hundred fifty-one thousand, nine hundred ninety-eight".