73148781 has 4 divisors (see below), whose sum is σ = 97531712. Its totient is φ = 48765852.

The previous prime is 73148753. The next prime is 73148819. The reversal of 73148781 is 18784137.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18784137 = 3 ⋅6261379.

It is not a de Polignac number, because 73148781 - 2⁵ = 73148749 is a prime.

It is a super-2 number, since 2×73148781² = 10701488323571922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73148281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12191461 + ... + 12191466.

It is an arithmetic number, because the mean of its divisors is an integer number (24382928).

Almost surely, 2^73148781 is an apocalyptic number.

It is an amenable number.

73148781 is a deficient number, since it is larger than the sum of its proper divisors (24382931).

73148781 is a wasteful number, since it uses less digits than its factorization.

73148781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24382930.

The product of its digits is 37632, while the sum is 39.

The square root of 73148781 is about 8552.7060629955. The cubic root of 73148781 is about 418.2176567655.

The spelling of 73148781 in words is "seventy-three million, one hundred forty-eight thousand, seven hundred eighty-one".