11398978756 has 81 divisors (see below), whose sum is σ = 23030471919. Its totient is φ = 4932589200.

The previous prime is 11398978753. The next prime is 11398978777. The reversal of 11398978756 is 65787989311.

The square root of 11398978756 is 106766.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11398978753) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 54023491 + ... + 54023701.

Almost surely, 2^11398978756 is an apocalyptic number.

11398978756 is the 106766-th square number.

It is an amenable number.

11398978756 is an abundant number, since it is smaller than the sum of its proper divisors (11631493163).

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

11398978756 is a wasteful number, since it uses less digits than its factorization.

11398978756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494 (or 247 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 64.

Multiplying 11398978756 by its sum of digits (64), we get a square (729534640384 = 854128²).

The spelling of 11398978756 in words is "eleven billion, three hundred ninety-eight million, nine hundred seventy-eight thousand, seven hundred fifty-six".