28149478 has 8 divisors (see below), whose sum is σ = 48256272. Its totient is φ = 12064056.

The previous prime is 28149463. The next prime is 28149479. The reversal of 28149478 is 87494182.

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

It is a super-2 number, since 2×28149478² = 1584786223344968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28149479) 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, 1005325 + ... + 1005352.

It is an arithmetic number, because the mean of its divisors is an integer number (6032034).

Almost surely, 2^28149478 is an apocalyptic number.

28149478 is a deficient number, since it is larger than the sum of its proper divisors (20106794).

28149478 is a wasteful number, since it uses less digits than its factorization.

28149478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010686.

The product of its digits is 129024, while the sum is 43.

The square root of 28149478 is about 5305.6081649515. The cubic root of 28149478 is about 304.1982994645.

The spelling of 28149478 in words is "twenty-eight million, one hundred forty-nine thousand, four hundred seventy-eight".