55687772 has 24 divisors (see below), whose sum is σ = 115217760. Its totient is φ = 23042880.

The previous prime is 55687759. The next prime is 55687777. The reversal of 55687772 is 27778655.

It is a happy number.

It is a super-2 number, since 2×55687772² = 6202255900647968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55687777) 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, 33479 + ... + 35102.

It is an arithmetic number, because the mean of its divisors is an integer number (4800740).

Almost surely, 2^55687772 is an apocalyptic number.

It is an amenable number.

55687772 is an abundant number, since it is smaller than the sum of its proper divisors (59529988).

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

55687772 is a wasteful number, since it uses less digits than its factorization.

55687772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68621 (or 68619 counting only the distinct ones).

The product of its digits is 823200, while the sum is 47.

The square root of 55687772 is about 7462.4240029631. The cubic root of 55687772 is about 381.8738744640.

The spelling of 55687772 in words is "fifty-five million, six hundred eighty-seven thousand, seven hundred seventy-two".