1777216420 has 48 divisors (see below), whose sum is σ = 4269057408. Its totient is φ = 608797440.

The previous prime is 1777216411. The next prime is 1777216447. The reversal of 1777216420 is 246127771.

It is a self number, because there is not a number n which added to its sum of digits gives 1777216420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175824 + ... + 185656.

It is an arithmetic number, because the mean of its divisors is an integer number (88938696).

Almost surely, 2^1777216420 is an apocalyptic number.

1777216420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1777216420 is an abundant number, since it is smaller than the sum of its proper divisors (2491840988).

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

1777216420 is a wasteful number, since it uses less digits than its factorization.

1777216420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11140 (or 11138 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The square root of 1777216420 is about 42157.0447256446. The cubic root of 1777216420 is about 1211.2862082845.

The spelling of 1777216420 in words is "one billion, seven hundred seventy-seven million, two hundred sixteen thousand, four hundred twenty".