77277420 has 144 divisors (see below), whose sum is σ = 264176640. Its totient is φ = 18115200.

The previous prime is 77277419. The next prime is 77277439. The reversal of 77277420 is 2477277.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60751 + ... + 62009.

It is an arithmetic number, because the mean of its divisors is an integer number (1834560).

Almost surely, 2^77277420 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 77277420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132088320).

77277420 is an abundant number, since it is smaller than the sum of its proper divisors (186899220).

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

77277420 is a wasteful number, since it uses less digits than its factorization.

77277420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 38416, while the sum is 36.

The square root of 77277420 is about 8790.7576465285. The cubic root of 77277420 is about 425.9423978189.

The spelling of 77277420 in words is "seventy-seven million, two hundred seventy-seven thousand, four hundred twenty".