84781042 has 4 divisors (see below), whose sum is σ = 127171566. Its totient is φ = 42390520.

The previous prime is 84781019. The next prime is 84781061. The reversal of 84781042 is 24018748.

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., 83338641 + 1442401 = 9129^2 + 1201^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84780989 and 84781007.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21195259 + ... + 21195262.

Almost surely, 2^84781042 is an apocalyptic number.

84781042 is a deficient number, since it is larger than the sum of its proper divisors (42390524).

84781042 is a wasteful number, since it uses less digits than its factorization.

84781042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42390523.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 84781042 is about 9207.6621354174. The cubic root of 84781042 is about 439.3051049157.

The spelling of 84781042 in words is "eighty-four million, seven hundred eighty-one thousand, forty-two".