61217572 has 24 divisors (see below), whose sum is σ = 115630200. Its totient is φ = 28190976.

The previous prime is 61217567. The next prime is 61217593. The reversal of 61217572 is 27571216.

It can be written as a sum of positive squares in 4 ways, for example, as 1865956 + 59351616 = 1366^2 + 7704^2 .

It is a super-2 number, since 2×61217572² = 7495182243150368, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28554 + ... + 30622.

It is an arithmetic number, because the mean of its divisors is an integer number (4817925).

Almost surely, 2^61217572 is an apocalyptic number.

It is an amenable number.

61217572 is a deficient number, since it is larger than the sum of its proper divisors (54412628).

61217572 is a wasteful number, since it uses less digits than its factorization.

61217572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 2653 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 61217572 is about 7824.1658980367. The cubic root of 61217572 is about 394.1171802247.

Adding to 61217572 its reverse (27571216), we get a palindrome (88788788).

The spelling of 61217572 in words is "sixty-one million, two hundred seventeen thousand, five hundred seventy-two".