77842620 has 168 divisors, whose sum is σ = 258909840. Its totient is φ = 19595520.

The previous prime is 77842579. The next prime is 77842651. The reversal of 77842620 is 2624877.

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

It is a congruent number.

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 55 ways as a sum of consecutive naturals, for example, 276880 + ... + 277160.

It is an arithmetic number, because the mean of its divisors is an integer number (1541130).

Almost surely, 2^77842620 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 77842620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129454920).

77842620 is an abundant number, since it is smaller than the sum of its proper divisors (181067220).

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

77842620 is a wasteful number, since it uses less digits than its factorization.

77842620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 310 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 77842620 is about 8822.8464794532. The cubic root of 77842620 is about 426.9783109972.

It can be divided in two parts, 7784 and 2620, that added together give a square (10404 = 102²).

The spelling of 77842620 in words is "seventy-seven million, eight hundred forty-two thousand, six hundred twenty".