100778428 has 6 divisors (see below), whose sum is σ = 176362256. Its totient is φ = 50389212.

The previous prime is 100778423. The next prime is 100778443. The reversal of 100778428 is 824877001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100778423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12597300 + ... + 12597307.

Almost surely, 2^100778428 is an apocalyptic number.

It is an amenable number.

100778428 is a deficient number, since it is larger than the sum of its proper divisors (75583828).

100778428 is a wasteful number, since it uses less digits than its factorization.

100778428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25194611 (or 25194609 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 100778428 is about 10038.8459496099. The cubic root of 100778428 is about 465.3601526311.

The spelling of 100778428 in words is "one hundred million, seven hundred seventy-eight thousand, four hundred twenty-eight".