7755228 has 72 divisors (see below), whose sum is σ = 21494928. Its totient is φ = 2343168.

The previous prime is 7755203. The next prime is 7755233. The reversal of 7755228 is 8225577.

It is a super-2 number, since 2×7755228² = 120287122663968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7755192 and 7755201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34051 + ... + 34277.

Almost surely, 2^7755228 is an apocalyptic number.

7755228 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7755228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10747464).

7755228 is an abundant number, since it is smaller than the sum of its proper divisors (13739700).

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

7755228 is a wasteful number, since it uses less digits than its factorization.

7755228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 318 counting only the distinct ones).

The product of its digits is 39200, while the sum is 36.

The square root of 7755228 is about 2784.8209996335. The cubic root of 7755228 is about 197.9390690997.

It can be divided in two parts, 7755 and 228, that multiplied together give a triangular number (1768140 = T₁₈₈₀).

The spelling of 7755228 in words is "seven million, seven hundred fifty-five thousand, two hundred twenty-eight".