11772428578 has 4 divisors (see below), whose sum is σ = 17658642870. Its totient is φ = 5886214288.

The previous prime is 11772428573. The next prime is 11772428581. The reversal of 11772428578 is 87582427711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87582427711 = 41687 ⋅2100953.

It can be written as a sum of positive squares in only one way, i.e., 11766391729 + 6036849 = 108473^2 + 2457^2 .

It is a super-2 number, since 2×11772428578² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11772428573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2943107143 + ... + 2943107146.

Almost surely, 2^11772428578 is an apocalyptic number.

11772428578 is a deficient number, since it is larger than the sum of its proper divisors (5886214292).

11772428578 is an equidigital number, since it uses as much as digits as its factorization.

11772428578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5886214291.

The product of its digits is 1756160, while the sum is 52.

The spelling of 11772428578 in words is "eleven billion, seven hundred seventy-two million, four hundred twenty-eight thousand, five hundred seventy-eight".