61215656 has 16 divisors (see below), whose sum is σ = 115084800. Its totient is φ = 30526384.

The previous prime is 61215653. The next prime is 61215659. The reversal of 61215656 is 65651216.

It is an interprime number because it is at equal distance from previous prime (61215653) and next prime (61215659).

It is not an unprimeable number, because it can be changed into a prime (61215653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6926 + ... + 13053.

It is an arithmetic number, because the mean of its divisors is an integer number (7192800).

Almost surely, 2^61215656 is an apocalyptic number.

It is an amenable number.

61215656 is a deficient number, since it is larger than the sum of its proper divisors (53869144).

61215656 is a wasteful number, since it uses less digits than its factorization.

61215656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20368 (or 20364 counting only the distinct ones).

The product of its digits is 10800, while the sum is 32.

The square root of 61215656 is about 7824.0434559120. The cubic root of 61215656 is about 394.1130684620.

The spelling of 61215656 in words is "sixty-one million, two hundred fifteen thousand, six hundred fifty-six".