42778624 has 60 divisors (see below), whose sum is σ = 98038864. Its totient is φ = 18284544.

The previous prime is 42778609. The next prime is 42778627. The reversal of 42778624 is 42687724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114502 + ... + 114874.

Almost surely, 2^42778624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42778624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49019432).

42778624 is an abundant number, since it is smaller than the sum of its proper divisors (55260240).

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

42778624 is an frugal number, since it uses more digits than its factorization.

42778624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 382 counting only the distinct ones).

The product of its digits is 150528, while the sum is 40.

The square root of 42778624 is about 6540.5369810131. The cubic root of 42778624 is about 349.7375556386.

The spelling of 42778624 in words is "forty-two million, seven hundred seventy-eight thousand, six hundred twenty-four".