61317072 has 30 divisors (see below), whose sum is σ = 171603042. Its totient is φ = 20438976.

The previous prime is 61317037. The next prime is 61317083. The reversal of 61317072 is 27071316.

It can be written as a sum of positive squares in only one way, i.e., 58614336 + 2702736 = 7656^2 + 1644^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212763 + ... + 213050.

Almost surely, 2^61317072 is an apocalyptic number.

It is an amenable number.

61317072 is an abundant number, since it is smaller than the sum of its proper divisors (110285970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61317072 is a wasteful number, since it uses less digits than its factorization.

61317072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425827 (or 425818 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 61317072 is about 7830.5218216923. The cubic root of 61317072 is about 394.3305908053.

Adding to 61317072 its reverse (27071316), we get a palindrome (88388388).

It can be divided in two parts, 6131 and 7072, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 61317072 in words is "sixty-one million, three hundred seventeen thousand, seventy-two".