44778889 has 4 divisors (see below), whose sum is σ = 44974660. Its totient is φ = 44583120.

The previous prime is 44778887. The next prime is 44778893. The reversal of 44778889 is 98887744.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22848400 + 21930489 = 4780^2 + 4683^2 .

It is a cyclic number.

It is not a de Polignac number, because 44778889 - 2¹ = 44778887 is a prime.

It is a super-4 number, since 4×44778889⁴ (a number of 32 digits) contains 4444 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (44778887) 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, 97542 + ... + 97999.

It is an arithmetic number, because the mean of its divisors is an integer number (11243665).

Almost surely, 2^44778889 is an apocalyptic number.

It is an amenable number.

44778889 is a deficient number, since it is larger than the sum of its proper divisors (195771).

44778889 is a wasteful number, since it uses less digits than its factorization.

44778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195770.

The product of its digits is 3612672, while the sum is 55.

The square root of 44778889 is about 6691.7029969956. The cubic root of 44778889 is about 355.1058046064.

It can be divided in two parts, 4477 and 8889, that added together give a triangular number (13366 = T₁₆₃).

The spelling of 44778889 in words is "forty-four million, seven hundred seventy-eight thousand, eight hundred eighty-nine".