63845405 has 16 divisors (see below), whose sum is σ = 84523824. Its totient is φ = 45995520.

The previous prime is 63845393. The next prime is 63845413. The reversal of 63845405 is 50454836.

It can be written as a sum of positive squares in 8 ways, for example, as 8655364 + 55190041 = 2942^2 + 7429^2 .

It is not a de Polignac number, because 63845405 - 2¹⁴ = 63829021 is a prime.

It is a super-2 number, since 2×63845405² = 8152471479228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9314 + ... + 14643.

It is an arithmetic number, because the mean of its divisors is an integer number (5282739).

Almost surely, 2^63845405 is an apocalyptic number.

63845405 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

63845405 is a deficient number, since it is larger than the sum of its proper divisors (20678419).

63845405 is a wasteful number, since it uses less digits than its factorization.

63845405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24016.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 63845405 is about 7990.3319705754. The cubic root of 63845405 is about 399.6776674074.

It can be divided in two parts, 63845 and 405, that multiplied together give a square (25857225 = 5085²).

The spelling of 63845405 in words is "sixty-three million, eight hundred forty-five thousand, four hundred five".