42786978 has 32 divisors (see below), whose sum is σ = 94307136. Its totient is φ = 12858048.

The previous prime is 42786973. The next prime is 42786983. The reversal of 42786978 is 87968724.

It is an interprime number because it is at equal distance from previous prime (42786973) and next prime (42786983).

It is a super-3 number, since 3×42786978³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42786978.

It is not an unprimeable number, because it can be changed into a prime (42786973) 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, 3025 + ... + 9732.

It is an arithmetic number, because the mean of its divisors is an integer number (2947098).

Almost surely, 2^42786978 is an apocalyptic number.

42786978 is an abundant number, since it is smaller than the sum of its proper divisors (51520158).

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

42786978 is a wasteful number, since it uses less digits than its factorization.

42786978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12818.

The product of its digits is 1354752, while the sum is 51.

The square root of 42786978 is about 6541.1755824164. The cubic root of 42786978 is about 349.7603202587.

The spelling of 42786978 in words is "forty-two million, seven hundred eighty-six thousand, nine hundred seventy-eight".