77068992 has 224 divisors, whose sum is σ = 274466304. Its totient is φ = 18432000.

The previous prime is 77068949. The next prime is 77069011. The reversal of 77068992 is 29986077.

It is a tau number, because it is divible by the number of its divisors (224).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 191992 + ... + 192392.

It is an arithmetic number, because the mean of its divisors is an integer number (1225296).

Almost surely, 2^77068992 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 77068992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137233152).

77068992 is an abundant number, since it is smaller than the sum of its proper divisors (197397312).

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

77068992 is a wasteful number, since it uses less digits than its factorization.

77068992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 48.

The square root of 77068992 is about 8778.8946912467. The cubic root of 77068992 is about 425.5591109643.

The spelling of 77068992 in words is "seventy-seven million, sixty-eight thousand, nine hundred ninety-two".