53660391 has 16 divisors (see below), whose sum is σ = 72599520. Its totient is φ = 35251200.

The previous prime is 53660377. The next prime is 53660401. The reversal of 53660391 is 19306635.

It is not a de Polignac number, because 53660391 - 2⁵ = 53660359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53660371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123711 + ... + 124143.

It is an arithmetic number, because the mean of its divisors is an integer number (4537470).

Almost surely, 2^53660391 is an apocalyptic number.

53660391 is a deficient number, since it is larger than the sum of its proper divisors (18939129).

53660391 is a wasteful number, since it uses less digits than its factorization.

53660391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 14580, while the sum is 33.

The square root of 53660391 is about 7325.3253170081. The cubic root of 53660391 is about 377.1822767033.

The spelling of 53660391 in words is "fifty-three million, six hundred sixty thousand, three hundred ninety-one".