77720798 has 16 divisors (see below), whose sum is σ = 119798784. Its totient is φ = 37798200.

The previous prime is 77720791. The next prime is 77720801. The reversal of 77720798 is 89702777.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77720791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13223 + ... + 18173.

It is an arithmetic number, because the mean of its divisors is an integer number (7487424).

Almost surely, 2^77720798 is an apocalyptic number.

77720798 is a deficient number, since it is larger than the sum of its proper divisors (42077986).

77720798 is a wasteful number, since it uses less digits than its factorization.

77720798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5167.

The product of its (nonzero) digits is 345744, while the sum is 47.

The square root of 77720798 is about 8815.9399952586. The cubic root of 77720798 is about 426.7554574596.

The spelling of 77720798 in words is "seventy-seven million, seven hundred twenty thousand, seven hundred ninety-eight".