988777777 has 8 divisors (see below), whose sum is σ = 1070415360. Its totient is φ = 907937040.

The previous prime is 988777729. The next prime is 988777787. The reversal of 988777777 is 777777889.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988777777 is a prime.

It is a super-4 number, since 4×988777777⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (988777787) 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, 196627 + ... + 201592.

It is an arithmetic number, because the mean of its divisors is an integer number (133801920).

Almost surely, 2^988777777 is an apocalyptic number.

It is an amenable number.

988777777 is a deficient number, since it is larger than the sum of its proper divisors (81637583).

988777777 is a wasteful number, since it uses less digits than its factorization.

988777777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398423.

The product of its digits is 67765824, while the sum is 67.

The square root of 988777777 is about 31444.8370483932. The cubic root of 988777777 is about 996.2451779575.

The spelling of 988777777 in words is "nine hundred eighty-eight million, seven hundred seventy-seven thousand, seven hundred seventy-seven".