28961558691936 has 48 divisors (see below), whose sum is σ = 81872098613424. Its totient is φ = 8911248827904.

The previous prime is 28961558691929. The next prime is 28961558691983. The reversal of 28961558691936 is 63919685516982.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11603187331 + ... + 11603189826.

It is an arithmetic number, because the mean of its divisors is an integer number (1705668721113).

Almost surely, 2^{28961558691936} is an apocalyptic number.

28961558691936 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28961558691936 is an abundant number, since it is smaller than the sum of its proper divisors (52910539921488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28961558691936 is a wasteful number, since it uses less digits than its factorization.

28961558691936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23206377183 (or 23206377175 counting only the distinct ones).

The product of its digits is 1511654400, while the sum is 78.

The spelling of 28961558691936 in words is "twenty-eight trillion, nine hundred sixty-one billion, five hundred fifty-eight million, six hundred ninety-one thousand, nine hundred thirty-six".