53399978 has 8 divisors (see below), whose sum is σ = 80154468. Its totient is φ = 26681824.

The previous prime is 53399947. The next prime is 53399981. The reversal of 53399978 is 87999335.

It can be written as a sum of positive squares in 2 ways, for example, as 46963609 + 6436369 = 6853^2 + 2537^2 .

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, 5051 + ... + 11502.

Almost surely, 2^53399978 is an apocalyptic number.

53399978 is a deficient number, since it is larger than the sum of its proper divisors (26754490).

53399978 is a wasteful number, since it uses less digits than its factorization.

53399978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18168.

The product of its digits is 1837080, while the sum is 53.

The square root of 53399978 is about 7307.5288572814. The cubic root of 53399978 is about 376.5711338723.

The spelling of 53399978 in words is "fifty-three million, three hundred ninety-nine thousand, nine hundred seventy-eight".