76621773420 has 288 divisors, whose sum is σ = 245383407360. Its totient is φ = 20066745600.

The previous prime is 76621773407. The next prime is 76621773421. The reversal of 76621773420 is 2437712667.

76621773420 is a `hidden beast` number, since 7 + 6 + 6 + 217 + 7 + 3 + 420 = 666.

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 (76621773421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 68228979 + ... + 68230101.

It is an arithmetic number, because the mean of its divisors is an integer number (852025720).

Almost surely, 2^76621773420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 76621773420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122691703680).

76621773420 is an abundant number, since it is smaller than the sum of its proper divisors (168761633940).

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

76621773420 is a wasteful number, since it uses less digits than its factorization.

76621773420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387 (or 1373 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The spelling of 76621773420 in words is "seventy-six billion, six hundred twenty-one million, seven hundred seventy-three thousand, four hundred twenty".