28621471 has 8 divisors (see below), whose sum is σ = 29070720. Its totient is φ = 28174872.

The previous prime is 28621469. The next prime is 28621493. The reversal of 28621471 is 17412682.

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 28621471 - 2¹ = 28621469 is a prime.

It is a super-3 number, since 3×28621471³ (a number of 23 digits) contains 333 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 (28621171) 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, 34366 + ... + 35188.

It is an arithmetic number, because the mean of its divisors is an integer number (3633840).

Almost surely, 2^28621471 is an apocalyptic number.

28621471 is a deficient number, since it is larger than the sum of its proper divisors (449249).

28621471 is an equidigital number, since it uses as much as digits as its factorization.

28621471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325.

The product of its digits is 5376, while the sum is 31.

The square root of 28621471 is about 5349.9038309114. The cubic root of 28621471 is about 305.8890872045.

It can be divided in two parts, 28621 and 471, that added together give a palindrome (29092).

The spelling of 28621471 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred seventy-one".