10138778 has 8 divisors (see below), whose sum is σ = 16378068. Its totient is φ = 4679424.

The previous prime is 10138757. The next prime is 10138787. The reversal of 10138778 is 87783101.

10138778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 8922169 + 1216609 = 2987^2 + 1103^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194951 + ... + 195002.

Almost surely, 2^10138778 is an apocalyptic number.

10138778 is a deficient number, since it is larger than the sum of its proper divisors (6239290).

10138778 is a wasteful number, since it uses less digits than its factorization.

10138778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389968.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 10138778 is about 3184.1447831404. The cubic root of 10138778 is about 216.4355210169.

The spelling of 10138778 in words is "ten million, one hundred thirty-eight thousand, seven hundred seventy-eight".