10649978 has 4 divisors (see below), whose sum is σ = 15974970. Its totient is φ = 5324988.

The previous prime is 10649959. The next prime is 10649981. The reversal of 10649978 is 87994601.

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

It can be written as a sum of positive squares in only one way, i.e., 10647169 + 2809 = 3263^2 + 53^2 .

It is a super-2 number, since 2×10649978² = 226844062800968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2662493 + ... + 2662496.

Almost surely, 2^10649978 is an apocalyptic number.

10649978 is a deficient number, since it is larger than the sum of its proper divisors (5324992).

10649978 is an equidigital number, since it uses as much as digits as its factorization.

10649978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5324991.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 10649978 is about 3263.4304037316. The cubic root of 10649978 is about 220.0136217461.

The spelling of 10649978 in words is "ten million, six hundred forty-nine thousand, nine hundred seventy-eight".