55407865 has 8 divisors (see below), whose sum is σ = 68035968. Its totient is φ = 43295280.

The previous prime is 55407853. The next prime is 55407871. The reversal of 55407865 is 56870455.

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

It is not a de Polignac number, because 55407865 - 2⁹ = 55407353 is a prime.

It is a super-3 number, since 3×55407865³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128641 + ... + 129070.

It is an arithmetic number, because the mean of its divisors is an integer number (8504496).

Almost surely, 2^55407865 is an apocalyptic number.

It is an amenable number.

55407865 is a deficient number, since it is larger than the sum of its proper divisors (12628103).

55407865 is a wasteful number, since it uses less digits than its factorization.

55407865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257759.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 55407865 is about 7443.6459480553. The cubic root of 55407865 is about 381.2329871473.

The spelling of 55407865 in words is "fifty-five million, four hundred seven thousand, eight hundred sixty-five".