61673731 has 16 divisors (see below), whose sum is σ = 72108288. Its totient is φ = 51660000.

The previous prime is 61673719. The next prime is 61673737. The reversal of 61673731 is 13737616.

It is a happy number.

It is not a de Polignac number, because 61673731 - 2⁵ = 61673699 is a prime.

It is a super-2 number, since 2×61673731² = 7607298190920722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61673737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58156 + ... + 59206.

It is an arithmetic number, because the mean of its divisors is an integer number (4506768).

Almost surely, 2^61673731 is an apocalyptic number.

61673731 is a deficient number, since it is larger than the sum of its proper divisors (10434557).

61673731 is a wasteful number, since it uses less digits than its factorization.

61673731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242.

The product of its digits is 15876, while the sum is 34.

The square root of 61673731 is about 7853.2624430869. The cubic root of 61673731 is about 395.0936721710.

It can be divided in two parts, 616 and 73731, that added together give a palindrome (74347).

The spelling of 61673731 in words is "sixty-one million, six hundred seventy-three thousand, seven hundred thirty-one".