28761345 has 32 divisors (see below), whose sum is σ = 53827200. Its totient is φ = 14530752.

The previous prime is 28761323. The next prime is 28761371. The reversal of 28761345 is 54316782.

It is not a de Polignac number, because 28761345 - 2¹⁶ = 28695809 is a prime.

It is a super-3 number, since 3×28761345³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3042 + ... + 8171.

It is an arithmetic number, because the mean of its divisors is an integer number (1682100).

Almost surely, 2^28761345 is an apocalyptic number.

It is an amenable number.

28761345 is a deficient number, since it is larger than the sum of its proper divisors (25065855).

28761345 is a wasteful number, since it uses less digits than its factorization.

28761345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11246 (or 11240 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 28761345 is about 5362.9604697406. The cubic root of 28761345 is about 306.3865740981.

The spelling of 28761345 in words is "twenty-eight million, seven hundred sixty-one thousand, three hundred forty-five".