42678731 has 16 divisors (see below), whose sum is σ = 47308800. Its totient is φ = 38320128.

The previous prime is 42678697. The next prime is 42678737. The reversal of 42678731 is 13787624.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42678731 is a prime.

It is a super-2 number, since 2×42678731² = 3642948159540722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42678737) 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, 55115 + ... + 55883.

It is an arithmetic number, because the mean of its divisors is an integer number (2956800).

Almost surely, 2^42678731 is an apocalyptic number.

42678731 is a deficient number, since it is larger than the sum of its proper divisors (4630069).

42678731 is a wasteful number, since it uses less digits than its factorization.

42678731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

The product of its digits is 56448, while the sum is 38.

The square root of 42678731 is about 6532.8960652991. The cubic root of 42678731 is about 349.4651176843.

The spelling of 42678731 in words is "forty-two million, six hundred seventy-eight thousand, seven hundred thirty-one".