1177788420 has 36 divisors (see below), whose sum is σ = 3572625420. Its totient is φ = 314076864.

The previous prime is 1177788413. The next prime is 1177788421. The reversal of 1177788420 is 248877711.

It can be written as a sum of positive squares in 2 ways, for example, as 365880384 + 811908036 = 19128^2 + 28494^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1177788421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3271455 + ... + 3271814.

It is an arithmetic number, because the mean of its divisors is an integer number (99239595).

Almost surely, 2^1177788420 is an apocalyptic number.

1177788420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1177788420 is an abundant number, since it is smaller than the sum of its proper divisors (2394837000).

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

1177788420 is a wasteful number, since it uses less digits than its factorization.

1177788420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6543284 (or 6543279 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 45.

The square root of 1177788420 is about 34318.9221858729. The cubic root of 1177788420 is about 1056.0612158900.

The spelling of 1177788420 in words is "one billion, one hundred seventy-seven million, seven hundred eighty-eight thousand, four hundred twenty".