61861716 has 54 divisors (see below), whose sum is σ = 181908090. Its totient is φ = 17674272.

The previous prime is 61861693. The next prime is 61861717. The reversal of 61861716 is 61716816.

It can be written as a sum of positive squares in only one way, i.e., 61685316 + 176400 = 7854^2 + 420^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61861717) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15771 + ... + 19298.

Almost surely, 2^61861716 is an apocalyptic number.

It is an amenable number.

61861716 is an abundant number, since it is smaller than the sum of its proper divisors (120046374).

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

61861716 is a wasteful number, since it uses less digits than its factorization.

61861716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35093 (or 35081 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 61861716 is about 7865.2219294817. The cubic root of 61861716 is about 395.4946875836.

The spelling of 61861716 in words is "sixty-one million, eight hundred sixty-one thousand, seven hundred sixteen".