10721778 has 8 divisors (see below), whose sum is σ = 21443568. Its totient is φ = 3573924.

The previous prime is 10721773. The next prime is 10721803. The reversal of 10721778 is 87712701.

It is a sphenic number, since it is the product of 3 distinct primes.

10721778 is an admirable number.

It is a super-2 number, since 2×10721778² = 229913046962568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10721771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 893476 + ... + 893487.

It is an arithmetic number, because the mean of its divisors is an integer number (2680446).

Almost surely, 2^10721778 is an apocalyptic number.

10721778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

10721778 is a wasteful number, since it uses less digits than its factorization.

10721778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786968.

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

The square root of 10721778 is about 3274.4126190815. The cubic root of 10721778 is about 220.5069439044.

It can be divided in two parts, 1072 and 1778, that added together give a triangular number (2850 = T₇₅).

The spelling of 10721778 in words is "ten million, seven hundred twenty-one thousand, seven hundred seventy-eight".