1245128640 has 448 divisors, whose sum is σ = 4806574080. Its totient is φ = 267079680.

The previous prime is 1245128627. The next prime is 1245128681. The reversal of 1245128640 is 468215421.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8957691 + ... + 8957829.

It is an arithmetic number, because the mean of its divisors is an integer number (10728960).

Almost surely, 2^1245128640 is an apocalyptic number.

1245128640 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 1245128640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2403287040).

1245128640 is an abundant number, since it is smaller than the sum of its proper divisors (3561445440).

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

1245128640 is a wasteful number, since it uses less digits than its factorization.

1245128640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 1245128640 is about 35286.3803754366. The cubic root of 1245128640 is about 1075.8161863608.

The spelling of 1245128640 in words is "one billion, two hundred forty-five million, one hundred twenty-eight thousand, six hundred forty".