101780745 has 32 divisors (see below), whose sum is σ = 178830720. Its totient is φ = 49021440.

The previous prime is 101780743. The next prime is 101780753. The reversal of 101780745 is 547087101.

It is not a de Polignac number, because 101780745 - 2¹ = 101780743 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (101780743) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23941 + ... + 27869.

It is an arithmetic number, because the mean of its divisors is an integer number (5588460).

Almost surely, 2^101780745 is an apocalyptic number.

101780745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

101780745 is a deficient number, since it is larger than the sum of its proper divisors (77049975).

101780745 is a wasteful number, since it uses less digits than its factorization.

101780745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105.

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 101780745 is about 10088.6443588819. The cubic root of 101780745 is about 466.8978511563.

Adding to 101780745 its sum of digits (33), we get a triangular number (101780778 = T₁₄₂₆₇).

The spelling of 101780745 in words is "one hundred one million, seven hundred eighty thousand, seven hundred forty-five".