36397778 has 4 divisors (see below), whose sum is σ = 54596670. Its totient is φ = 18198888.

The previous prime is 36397771. The next prime is 36397789. The reversal of 36397778 is 87779363.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87779363 = 7 ⋅12539909.

It can be written as a sum of positive squares in only one way, i.e., 31393609 + 5004169 = 5603^2 + 2237^2 .

It is not an unprimeable number, because it can be changed into a prime (36397771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099443 + ... + 9099446.

Almost surely, 2^36397778 is an apocalyptic number.

36397778 is a deficient number, since it is larger than the sum of its proper divisors (18198892).

36397778 is a wasteful number, since it uses less digits than its factorization.

36397778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18198891.

The product of its digits is 1333584, while the sum is 50.

The square root of 36397778 is about 6033.0571023321. The cubic root of 36397778 is about 331.4044155821.

The spelling of 36397778 in words is "thirty-six million, three hundred ninety-seven thousand, seven hundred seventy-eight".