28778217222 has 32 divisors (see below), whose sum is σ = 59660640000. Its totient is φ = 9243366048.

The previous prime is 28778217203. The next prime is 28778217241. The reversal of 28778217222 is 22271287782.

It is an interprime number because it is at equal distance from previous prime (28778217203) and next prime (28778217241).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78898 + ... + 252549.

It is an arithmetic number, because the mean of its divisors is an integer number (1864395000).

Almost surely, 2^28778217222 is an apocalyptic number.

28778217222 is an abundant number, since it is smaller than the sum of its proper divisors (30882422778).

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

28778217222 is a wasteful number, since it uses less digits than its factorization.

28778217222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331980.

The product of its digits is 702464, while the sum is 48.

The spelling of 28778217222 in words is "twenty-eight billion, seven hundred seventy-eight million, two hundred seventeen thousand, two hundred twenty-two".