53689778 has 4 divisors (see below), whose sum is σ = 80534670. Its totient is φ = 26844888.

The previous prime is 53689777. The next prime is 53689781. The reversal of 53689778 is 87798635.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87798635 = 5 ⋅17559727.

It can be written as a sum of positive squares in only one way, i.e., 52374169 + 1315609 = 7237^2 + 1147^2 .

It is not an unprimeable number, because it can be changed into a prime (53689777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13422443 + ... + 13422446.

Almost surely, 2^53689778 is an apocalyptic number.

53689778 is a deficient number, since it is larger than the sum of its proper divisors (26844892).

53689778 is a wasteful number, since it uses less digits than its factorization.

53689778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26844891.

The product of its digits is 2540160, while the sum is 53.

The square root of 53689778 is about 7327.3308919415. The cubic root of 53689778 is about 377.2511184974.

The spelling of 53689778 in words is "fifty-three million, six hundred eighty-nine thousand, seven hundred seventy-eight".