28151554 has 8 divisors (see below), whose sum is σ = 42289020. Its totient is φ = 14055216.

The previous prime is 28151549. The next prime is 28151569. The reversal of 28151554 is 45515182.

It can be written as a sum of positive squares in 2 ways, for example, as 24059025 + 4092529 = 4905^2 + 2023^2 .

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

It is a super-2 number, since 2×28151554² = 1585019985229832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8509 + ... + 11344.

Almost surely, 2^28151554 is an apocalyptic number.

28151554 is a deficient number, since it is larger than the sum of its proper divisors (14137466).

28151554 is a wasteful number, since it uses less digits than its factorization.

28151554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20564.

The product of its digits is 8000, while the sum is 31.

The square root of 28151554 is about 5305.8038033836. The cubic root of 28151554 is about 304.2057774024.

The spelling of 28151554 in words is "twenty-eight million, one hundred fifty-one thousand, five hundred fifty-four".