46778521 has 4 divisors (see below), whose sum is σ = 47545444. Its totient is φ = 46011600.

The previous prime is 46778519. The next prime is 46778533. The reversal of 46778521 is 12587764.

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 11316496 + 35462025 = 3364^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 46778521 - 2¹ = 46778519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (46778561) 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, 383370 + ... + 383491.

It is an arithmetic number, because the mean of its divisors is an integer number (11886361).

Almost surely, 2^46778521 is an apocalyptic number.

It is an amenable number.

46778521 is a deficient number, since it is larger than the sum of its proper divisors (766923).

46778521 is an equidigital number, since it uses as much as digits as its factorization.

46778521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766922.

The product of its digits is 94080, while the sum is 40.

The square root of 46778521 is about 6839.4825096640. The cubic root of 46778521 is about 360.3148505849.

The spelling of 46778521 in words is "forty-six million, seven hundred seventy-eight thousand, five hundred twenty-one".