55432778 has 4 divisors (see below), whose sum is σ = 83149170. Its totient is φ = 27716388.

The previous prime is 55432763. The next prime is 55432813. The reversal of 55432778 is 87723455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39853969 + 15578809 = 6313^2 + 3947^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13858193 + ... + 13858196.

Almost surely, 2^55432778 is an apocalyptic number.

55432778 is a deficient number, since it is larger than the sum of its proper divisors (27716392).

55432778 is a wasteful number, since it uses less digits than its factorization.

55432778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27716391.

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

The square root of 55432778 is about 7445.3192006790. The cubic root of 55432778 is about 381.2901164272.

The spelling of 55432778 in words is "fifty-five million, four hundred thirty-two thousand, seven hundred seventy-eight".