28378471 has 8 divisors (see below), whose sum is σ = 31071888. Its totient is φ = 25704000.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378471 is 17487382.

28378471 = T₂₂₆₆ + T₂₂₆₇ + ... + T₂₂₇₆.

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 28378471 - 2¹¹ = 28376423 is a prime.

It is a super-3 number, since 3×28378471³ (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 (28378411) 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, 1500 + ... + 7681.

It is an arithmetic number, because the mean of its divisors is an integer number (3883986).

Almost surely, 2^28378471 is an apocalyptic number.

28378471 is a deficient number, since it is larger than the sum of its proper divisors (2693417).

28378471 is a wasteful number, since it uses less digits than its factorization.

28378471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473.

The product of its digits is 75264, while the sum is 40.

The square root of 28378471 is about 5327.1447324059. The cubic root of 28378471 is about 305.0209463353.

The spelling of 28378471 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred seventy-one".