101780428 has 48 divisors (see below), whose sum is σ = 200309760. Its totient is φ = 44996864.

The previous prime is 101780423. The next prime is 101780429. The reversal of 101780428 is 824087101.

It is a self number, because there is not a number n which added to its sum of digits gives 101780428.

It is not an unprimeable number, because it can be changed into a prime (101780423) 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 in 15 ways as a sum of consecutive naturals, for example, 91725 + ... + 92827.

It is an arithmetic number, because the mean of its divisors is an integer number (4173120).

Almost surely, 2^101780428 is an apocalyptic number.

It is an amenable number.

101780428 is a deficient number, since it is larger than the sum of its proper divisors (98529332).

101780428 is a wasteful number, since it uses less digits than its factorization.

101780428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206 (or 1204 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 101780428 is about 10088.6286481365. The cubic root of 101780428 is about 466.8973664321.

The spelling of 101780428 in words is "one hundred one million, seven hundred eighty thousand, four hundred twenty-eight".