101780442 has 32 divisors (see below), whose sum is σ = 226532160. Its totient is φ = 33873840.

The previous prime is 101780429. The next prime is 101780443. The reversal of 101780442 is 244087101.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (101780443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49813 + ... + 51815.

It is an arithmetic number, because the mean of its divisors is an integer number (7079130).

Almost surely, 2^101780442 is an apocalyptic number.

101780442 is an abundant number, since it is smaller than the sum of its proper divisors (124751718).

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

101780442 is a wasteful number, since it uses less digits than its factorization.

101780442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2955 (or 2949 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 101780442 is about 10088.6293419869. The cubic root of 101780442 is about 466.8973878395.

The spelling of 101780442 in words is "one hundred one million, seven hundred eighty thousand, four hundred forty-two".