28057762221 has 16 divisors (see below), whose sum is σ = 37948996800. Its totient is φ = 18437768960.

The previous prime is 28057762219. The next prime is 28057762223. The reversal of 28057762221 is 12226775082.

It is an interprime number because it is at equal distance from previous prime (28057762219) and next prime (28057762223).

It is a cyclic number.

It is not a de Polignac number, because 28057762221 - 2¹ = 28057762219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057762223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181020 + ... + 298133.

It is an arithmetic number, because the mean of its divisors is an integer number (2371812300).

Almost surely, 2^28057762221 is an apocalyptic number.

It is an amenable number.

28057762221 is a deficient number, since it is larger than the sum of its proper divisors (9891234579).

28057762221 is a wasteful number, since it uses less digits than its factorization.

28057762221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479436.

The product of its (nonzero) digits is 188160, while the sum is 42.

The spelling of 28057762221 in words is "twenty-eight billion, fifty-seven million, seven hundred sixty-two thousand, two hundred twenty-one".