28489790616651 has 144 divisors (see below), whose sum is σ = 51784462801344. Its totient is φ = 14960194518528.

The previous prime is 28489790616611. The next prime is 28489790616659. The reversal of 28489790616651 is 15661609798482.

28489790616651 is a `hidden beast` number, since 2 + 8 + 489 + 7 + 90 + 6 + 1 + 6 + 6 + 51 = 666.

It is not a de Polignac number, because 28489790616651 - 2⁶ = 28489790616587 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28489790616651.

It is not an unprimeable number, because it can be changed into a prime (28489790616659) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1964399466 + ... + 1964413968.

Almost surely, 2^{28489790616651} is an apocalyptic number.

28489790616651 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28489790616651 is a deficient number, since it is larger than the sum of its proper divisors (23294672184693).

28489790616651 is a wasteful number, since it uses less digits than its factorization.

28489790616651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16050 (or 16040 counting only the distinct ones).

The product of its (nonzero) digits is 313528320, while the sum is 72.

The spelling of 28489790616651 in words is "twenty-eight trillion, four hundred eighty-nine billion, seven hundred ninety million, six hundred sixteen thousand, six hundred fifty-one".