10778721 has 4 divisors (see below), whose sum is σ = 14371632. Its totient is φ = 7185812.

The previous prime is 10778717. The next prime is 10778741. The reversal of 10778721 is 12787701.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10778721 - 2² = 10778717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10778711) 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, 1796451 + ... + 1796456.

It is an arithmetic number, because the mean of its divisors is an integer number (3592908).

Almost surely, 2^10778721 is an apocalyptic number.

It is an amenable number.

10778721 is a deficient number, since it is larger than the sum of its proper divisors (3592911).

10778721 is an equidigital number, since it uses as much as digits as its factorization.

10778721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3592910.

The product of its (nonzero) digits is 5488, while the sum is 33.

The square root of 10778721 is about 3283.0962520158. The cubic root of 10778721 is about 220.8966231634.

The spelling of 10778721 in words is "ten million, seven hundred seventy-eight thousand, seven hundred twenty-one".