628647822 has 192 divisors, whose sum is σ = 1649037312. Its totient is φ = 171072000.

The previous prime is 628647809. The next prime is 628647839. The reversal of 628647822 is 228746826.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8611578 + ... + 8611650.

It is an arithmetic number, because the mean of its divisors is an integer number (8588736).

Almost surely, 2^628647822 is an apocalyptic number.

628647822 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 628647822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (824518656).

628647822 is an abundant number, since it is smaller than the sum of its proper divisors (1020389490).

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

628647822 is a wasteful number, since it uses less digits than its factorization.

628647822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207 (or 204 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 628647822 is about 25072.8502966855. The cubic root of 628647822 is about 856.6481311040.

The spelling of 628647822 in words is "six hundred twenty-eight million, six hundred forty-seven thousand, eight hundred twenty-two".