28801551 has 8 divisors (see below), whose sum is σ = 38660400. Its totient is φ = 19071872.

The previous prime is 28801547. The next prime is 28801603. The reversal of 28801551 is 15510882.

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 28801551 - 2² = 28801547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28801541) 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, 31770 + ... + 32663.

It is an arithmetic number, because the mean of its divisors is an integer number (4832550).

Almost surely, 2^28801551 is an apocalyptic number.

28801551 is a deficient number, since it is larger than the sum of its proper divisors (9858849).

28801551 is a wasteful number, since it uses less digits than its factorization.

28801551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64585.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 28801551 is about 5366.7076499470. The cubic root of 28801551 is about 306.5292753861.

The spelling of 28801551 in words is "twenty-eight million, eight hundred one thousand, five hundred fifty-one".