61491736 has 16 divisors (see below), whose sum is σ = 115404840. Its totient is φ = 30717120.

The previous prime is 61491709. The next prime is 61491739. The reversal of 61491736 is 63719416.

It is a junction number, because it is equal to n+sod(n) for n = 61491695 and 61491704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61491739) 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 3 ways as a sum of consecutive naturals, for example, 7516 + ... + 13396.

Almost surely, 2^61491736 is an apocalyptic number.

It is an amenable number.

61491736 is a deficient number, since it is larger than the sum of its proper divisors (53913104).

61491736 is a wasteful number, since it uses less digits than its factorization.

61491736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7194 (or 7190 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 61491736 is about 7841.6666595820. Note that the first 4 decimals coincide. The cubic root of 61491736 is about 394.7046577187.

The spelling of 61491736 in words is "sixty-one million, four hundred ninety-one thousand, seven hundred thirty-six".