55767640 has 32 divisors (see below), whose sum is σ = 130934880. Its totient is φ = 21336832.

The previous prime is 55767623. The next prime is 55767653. The reversal of 55767640 is 4676755.

It is a happy number.

55767640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55767640² = 6220059342339200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 55767593 and 55767602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29389 + ... + 31228.

It is an arithmetic number, because the mean of its divisors is an integer number (4091715).

Almost surely, 2^55767640 is an apocalyptic number.

It is an amenable number.

55767640 is an abundant number, since it is smaller than the sum of its proper divisors (75167240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55767640 is a wasteful number, since it uses less digits than its factorization.

55767640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60651 (or 60647 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 55767640 is about 7467.7734298785. The cubic root of 55767640 is about 382.0563497915.

The spelling of 55767640 in words is "fifty-five million, seven hundred sixty-seven thousand, six hundred forty".