44778013 has 12 divisors (see below), whose sum is σ = 52631292. Its totient is φ = 37981440.

The previous prime is 44777989. The next prime is 44778049. The reversal of 44778013 is 31087744.

It can be written as a sum of positive squares in 2 ways, for example, as 17288964 + 27489049 = 4158^2 + 5243^2 .

It is not a de Polignac number, because 44778013 - 2⁹ = 44777501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 44778013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44778053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (4385941).

Almost surely, 2^44778013 is an apocalyptic number.

It is an amenable number.

44778013 is a deficient number, since it is larger than the sum of its proper divisors (7853279).

44778013 is an equidigital number, since it uses as much as digits as its factorization.

44778013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9532 (or 9525 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 34.

The square root of 44778013 is about 6691.6375424854. The cubic root of 44778013 is about 355.1034889712.

The spelling of 44778013 in words is "forty-four million, seven hundred seventy-eight thousand, thirteen".