101778 has 8 divisors (see below), whose sum is σ = 203568. Its totient is φ = 33924.

The previous prime is 101771. The next prime is 101789. The reversal of 101778 is 877101.

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

101778 is an admirable number.

It is a super-2 number, since 2×101778² = 20717522568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8476 + ... + 8487.

It is an arithmetic number, because the mean of its divisors is an integer number (25446).

2¹⁰¹⁷⁷⁸ is an apocalyptic number.

101778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

101778 is a wasteful number, since it uses less digits than its factorization.

101778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16968.

The product of its (nonzero) digits is 392, while the sum is 24.

The square root of 101778 is about 319.0266446553. The cubic root of 101778 is about 46.6893653748.

Adding to 101778 its reverse (877101), we get a palindrome (978879).

The spelling of 101778 in words is "one hundred one thousand, seven hundred seventy-eight".