1225116728 has 32 divisors (see below), whose sum is σ = 2507760000. Its totient is φ = 556462560.

The previous prime is 1225116721. The next prime is 1225116757. The reversal of 1225116728 is 8276115221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225116721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138173 + ... + 146771.

It is an arithmetic number, because the mean of its divisors is an integer number (78367500).

Almost surely, 2^1225116728 is an apocalyptic number.

It is an amenable number.

1225116728 is an abundant number, since it is smaller than the sum of its proper divisors (1282643272).

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

1225116728 is a wasteful number, since it uses less digits than its factorization.

1225116728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10235 (or 10231 counting only the distinct ones).

The product of its digits is 13440, while the sum is 35.

The square root of 1225116728 is about 35001.6675031348. The cubic root of 1225116728 is about 1070.0214651996.

The spelling of 1225116728 in words is "one billion, two hundred twenty-five million, one hundred sixteen thousand, seven hundred twenty-eight".