1220857628 has 6 divisors (see below), whose sum is σ = 2136500856. Its totient is φ = 610428812.

The previous prime is 1220857607. The next prime is 1220857633. The reversal of 1220857628 is 8267580221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152607200 + ... + 152607207.

It is an arithmetic number, because the mean of its divisors is an integer number (356083476).

Almost surely, 2^1220857628 is an apocalyptic number.

It is an amenable number.

1220857628 is a deficient number, since it is larger than the sum of its proper divisors (915643228).

1220857628 is a wasteful number, since it uses less digits than its factorization.

1220857628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305214411 (or 305214409 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 1220857628 is about 34940.7731454242. The cubic root of 1220857628 is about 1068.7800542920.

The spelling of 1220857628 in words is "one billion, two hundred twenty million, eight hundred fifty-seven thousand, six hundred twenty-eight".