1154720640 has 128 divisors (see below), whose sum is σ = 3717043200. Its totient is φ = 304883712.

The previous prime is 1154720639. The next prime is 1154720669. The reversal of 1154720640 is 460274511.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1154720598 and 1154720607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194841 + ... + 200679.

It is an arithmetic number, because the mean of its divisors is an integer number (29039400).

Almost surely, 2^1154720640 is an apocalyptic number.

1154720640 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 1154720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1858521600).

1154720640 is an abundant number, since it is smaller than the sum of its proper divisors (2562322560).

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

1154720640 is a wasteful number, since it uses less digits than its factorization.

1154720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964 (or 5952 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 1154720640 is about 33981.1806740143. The cubic root of 1154720640 is about 1049.1211512312.

The spelling of 1154720640 in words is "one billion, one hundred fifty-four million, seven hundred twenty thousand, six hundred forty".