73781073 has 12 divisors (see below), whose sum is σ = 106649140. Its totient is φ = 49152096.

The previous prime is 73781069. The next prime is 73781087. The reversal of 73781073 is 37018737.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 986049 + 72795024 = 993^2 + 8532^2 .

It is not a de Polignac number, because 73781073 - 2² = 73781069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73781053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18615 + ... + 22227.

Almost surely, 2^73781073 is an apocalyptic number.

It is an amenable number.

73781073 is a deficient number, since it is larger than the sum of its proper divisors (32868067).

73781073 is a wasteful number, since it uses less digits than its factorization.

73781073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5888 (or 5885 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 73781073 is about 8589.5909681428. The cubic root of 73781073 is about 419.4192142530.

It can be divided in two parts, 737 and 81073, that added together give a triangular number (81810 = T₄₀₄).

The spelling of 73781073 in words is "seventy-three million, seven hundred eighty-one thousand, seventy-three".