28551955 has 4 divisors (see below), whose sum is σ = 34262352. Its totient is φ = 22841560.

The previous prime is 28551953. The next prime is 28551973. The reversal of 28551955 is 55915582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55915582 = 2 ⋅27957791.

It is not a de Polignac number, because 28551955 - 2¹ = 28551953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28551953) 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, 2855191 + ... + 2855200.

It is an arithmetic number, because the mean of its divisors is an integer number (8565588).

Almost surely, 2^28551955 is an apocalyptic number.

28551955 is a deficient number, since it is larger than the sum of its proper divisors (5710397).

28551955 is an equidigital number, since it uses as much as digits as its factorization.

28551955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5710396.

The product of its digits is 90000, while the sum is 40.

The square root of 28551955 is about 5343.4029419463. The cubic root of 28551955 is about 305.6412380219.

The spelling of 28551955 in words is "twenty-eight million, five hundred fifty-one thousand, nine hundred fifty-five".