1228306772 has 36 divisors (see below), whose sum is σ = 2681284704. Its totient is φ = 478321440.

The previous prime is 1228306759. The next prime is 1228306787. The reversal of 1228306772 is 2776038221.

It is a super-2 number, since 2×1228306772² = 3017475052282119968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 614078 + ... + 616074.

Almost surely, 2^1228306772 is an apocalyptic number.

It is an amenable number.

1228306772 is an abundant number, since it is smaller than the sum of its proper divisors (1452977932).

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

1228306772 is an equidigital number, since it uses as much as digits as its factorization.

1228306772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016 (or 2017 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 1228306772 is about 35047.2077632441. The cubic root of 1228306772 is about 1070.9493923266.

The spelling of 1228306772 in words is "one billion, two hundred twenty-eight million, three hundred six thousand, seven hundred seventy-two".