12633778 has 4 divisors (see below), whose sum is σ = 18950670. Its totient is φ = 6316888.

The previous prime is 12633773. The next prime is 12633791. The reversal of 12633778 is 87733621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87733621 = 19 ⋅4617559.

It can be written as a sum of positive squares in only one way, i.e., 10909809 + 1723969 = 3303^2 + 1313^2 .

It is a super-2 number, since 2×12633778² = 319224693106568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12633773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3158443 + ... + 3158446.

Almost surely, 2^12633778 is an apocalyptic number.

12633778 is a deficient number, since it is larger than the sum of its proper divisors (6316892).

12633778 is an equidigital number, since it uses as much as digits as its factorization.

12633778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6316891.

The product of its digits is 42336, while the sum is 37.

The square root of 12633778 is about 3554.4026221012. The cubic root of 12633778 is about 232.9044288672.

It can be divided in two parts, 1263 and 3778, that added together give a square (5041 = 71²).

The spelling of 12633778 in words is "twelve million, six hundred thirty-three thousand, seven hundred seventy-eight".