77620770 has 48 divisors (see below), whose sum is σ = 204265152. Its totient is φ = 20447520.

The previous prime is 77620729. The next prime is 77620787. The reversal of 77620770 is 7702677.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2275 + ... + 12665.

It is an arithmetic number, because the mean of its divisors is an integer number (4255524).

Almost surely, 2^77620770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77620770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102132576).

77620770 is an abundant number, since it is smaller than the sum of its proper divisors (126644382).

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

77620770 is a wasteful number, since it uses less digits than its factorization.

77620770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10487 (or 10484 counting only the distinct ones).

The product of its (nonzero) digits is 28812, while the sum is 36.

The square root of 77620770 is about 8810.2650357410. The cubic root of 77620770 is about 426.5722983299.

The spelling of 77620770 in words is "seventy-seven million, six hundred twenty thousand, seven hundred seventy".