1228687740 has 180 divisors, whose sum is σ = 4349460024. Its totient is φ = 280744128.

The previous prime is 1228687727. The next prime is 1228687753. The reversal of 1228687740 is 477868221.

It is an interprime number because it is at equal distance from previous prime (1228687727) and next prime (1228687753).

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 430759 + ... + 433601.

Almost surely, 2^1228687740 is an apocalyptic number.

1228687740 is a gapful number since it is divisible by the number (10) 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 1228687740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2174730012).

1228687740 is an abundant number, since it is smaller than the sum of its proper divisors (3120772284).

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

1228687740 is a wasteful number, since it uses less digits than its factorization.

1228687740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2886 (or 2860 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 1228687740 is about 35052.6424110936. The cubic root of 1228687740 is about 1071.0601017150.

The spelling of 1228687740 in words is "one billion, two hundred twenty-eight million, six hundred eighty-seven thousand, seven hundred forty".