28947663740 has 24 divisors (see below), whose sum is σ = 60950505840. Its totient is φ = 11548510848.

The previous prime is 28947663721. The next prime is 28947663751. The reversal of 28947663740 is 4736674982.

It is a super-2 number, since 2×28947663740² (a number of 22 digits) contains 22 as substring.

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, 1901897 + ... + 1917056.

It is an arithmetic number, because the mean of its divisors is an integer number (2539604410).

Almost surely, 2^28947663740 is an apocalyptic number.

28947663740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28947663740 is an abundant number, since it is smaller than the sum of its proper divisors (32002842100).

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

28947663740 is a wasteful number, since it uses less digits than its factorization.

28947663740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819341 (or 3819339 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 56.

The spelling of 28947663740 in words is "twenty-eight billion, nine hundred forty-seven million, six hundred sixty-three thousand, seven hundred forty".