42554778 has 32 divisors (see below), whose sum is σ = 99534336. Its totient is φ = 11875248.

The previous prime is 42554777. The next prime is 42554797. The reversal of 42554778 is 87745524.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (42554777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9976 + ... + 13587.

It is an arithmetic number, because the mean of its divisors is an integer number (3110448).

Almost surely, 2^42554778 is an apocalyptic number.

42554778 is an abundant number, since it is smaller than the sum of its proper divisors (56979558).

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

42554778 is a wasteful number, since it uses less digits than its factorization.

42554778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23618.

The product of its digits is 313600, while the sum is 42.

The square root of 42554778 is about 6523.4023331387. The cubic root of 42554778 is about 349.1264692730.

The spelling of 42554778 in words is "forty-two million, five hundred fifty-four thousand, seven hundred seventy-eight".