100506778 has 8 divisors (see below), whose sum is σ = 151685568. Its totient is φ = 49944924.

The previous prime is 100506773. The next prime is 100506797. The reversal of 100506778 is 877605001.

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

It is a super-2 number, since 2×100506778² = 20203224847882568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (100506773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153826 + ... + 154477.

It is an arithmetic number, because the mean of its divisors is an integer number (18960696).

Almost surely, 2^100506778 is an apocalyptic number.

100506778 is a deficient number, since it is larger than the sum of its proper divisors (51178790).

100506778 is a wasteful number, since it uses less digits than its factorization.

100506778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308468.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 100506778 is about 10025.3068780961. The cubic root of 100506778 is about 464.9416475897.

The spelling of 100506778 in words is "one hundred million, five hundred six thousand, seven hundred seventy-eight".