10621978 has 8 divisors (see below), whose sum is σ = 16087968. Its totient is φ = 5259324.

The previous prime is 10621973. The next prime is 10621981. The reversal of 10621978 is 87912601.

It is a happy number.

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

It is a super-2 number, since 2×10621978² = 225652833264968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10621973) 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, 25576 + ... + 25987.

It is an arithmetic number, because the mean of its divisors is an integer number (2010996).

Almost surely, 2^10621978 is an apocalyptic number.

10621978 is a deficient number, since it is larger than the sum of its proper divisors (5465990).

10621978 is a wasteful number, since it uses less digits than its factorization.

10621978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51668.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 10621978 is about 3259.1376159960. The cubic root of 10621978 is about 219.8206389347.

The spelling of 10621978 in words is "ten million, six hundred twenty-one thousand, nine hundred seventy-eight".