101945780 has 12 divisors (see below), whose sum is σ = 214086180. Its totient is φ = 40778304.

The previous prime is 101945777. The next prime is 101945783. The reversal of 101945780 is 87549101.

It is an interprime number because it is at equal distance from previous prime (101945777) and next prime (101945783).

It can be written as a sum of positive squares in 2 ways, for example, as 49730704 + 52215076 = 7052^2 + 7226^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 101945780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101945783) 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, 2548625 + ... + 2548664.

It is an arithmetic number, because the mean of its divisors is an integer number (17840515).

Almost surely, 2^101945780 is an apocalyptic number.

101945780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101945780 is an abundant number, since it is smaller than the sum of its proper divisors (112140400).

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

101945780 is a wasteful number, since it uses less digits than its factorization.

101945780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097298 (or 5097296 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 101945780 is about 10096.8202915571. The cubic root of 101945780 is about 467.1500693829.

The spelling of 101945780 in words is "one hundred one million, nine hundred forty-five thousand, seven hundred eighty".