55697609 has 8 divisors (see below), whose sum is σ = 61029120. Its totient is φ = 50410800.

The previous prime is 55697581. The next prime is 55697657. The reversal of 55697609 is 90679655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-55697609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55697659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8537 + ... + 13574.

It is an arithmetic number, because the mean of its divisors is an integer number (7628640).

Almost surely, 2^55697609 is an apocalyptic number.

It is an amenable number.

55697609 is a deficient number, since it is larger than the sum of its proper divisors (5331511).

55697609 is a wasteful number, since it uses less digits than its factorization.

55697609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22351.

The product of its (nonzero) digits is 510300, while the sum is 47.

The square root of 55697609 is about 7463.0830760484. The cubic root of 55697609 is about 381.8963585869.

The spelling of 55697609 in words is "fifty-five million, six hundred ninety-seven thousand, six hundred nine".