55778432 has 16 divisors (see below), whose sum is σ = 111121350. Its totient is φ = 27889152.

The previous prime is 55778417. The next prime is 55778449. The reversal of 55778432 is 23487755.

It can be written as a sum of positive squares in only one way, i.e., 28987456 + 26790976 = 5384^2 + 5176^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×55778432² = 6222466952757248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55778432.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217757 + ... + 218012.

Almost surely, 2^55778432 is an apocalyptic number.

It is an amenable number.

55778432 is a deficient number, since it is larger than the sum of its proper divisors (55342918).

55778432 is an equidigital number, since it uses as much as digits as its factorization.

55778432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435783 (or 435771 counting only the distinct ones).

The product of its digits is 235200, while the sum is 41.

The square root of 55778432 is about 7468.4959663911. The cubic root of 55778432 is about 382.0809930326.

The spelling of 55778432 in words is "fifty-five million, seven hundred seventy-eight thousand, four hundred thirty-two".