42073778 has 4 divisors (see below), whose sum is σ = 63110670. Its totient is φ = 21036888.

The previous prime is 42073777. The next prime is 42073783. The reversal of 42073778 is 87737024.

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., 40998409 + 1075369 = 6403^2 + 1037^2 .

It is a super-4 number, since 4×42073778⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (42073777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518443 + ... + 10518446.

Almost surely, 2^42073778 is an apocalyptic number.

42073778 is a deficient number, since it is larger than the sum of its proper divisors (21036892).

42073778 is a wasteful number, since it uses less digits than its factorization.

42073778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21036891.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 42073778 is about 6486.4302971665. The cubic root of 42073778 is about 347.8060805807.

The spelling of 42073778 in words is "forty-two million, seventy-three thousand, seven hundred seventy-eight".