11503772280 has 640 divisors, whose sum is σ = 51929095680. Its totient is φ = 2205895680.

The previous prime is 11503772263. The next prime is 11503772321. The reversal of 11503772280 is 8227730511.

11503772280 is a `hidden beast` number, since 1 + 1 + 5 + 0 + 377 + 2 + 280 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3241467 + ... + 3245013.

It is an arithmetic number, because the mean of its divisors is an integer number (81139212).

Almost surely, 2^11503772280 is an apocalyptic number.

11503772280 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 11503772280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25964547840).

11503772280 is an abundant number, since it is smaller than the sum of its proper divisors (40425323400).

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

11503772280 is a wasteful number, since it uses less digits than its factorization.

11503772280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601 (or 3588 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The spelling of 11503772280 in words is "eleven billion, five hundred three million, seven hundred seventy-two thousand, two hundred eighty".