61907688 has 48 divisors (see below), whose sum is σ = 169568100. Its totient is φ = 20401920.

The previous prime is 61907641. The next prime is 61907689. The reversal of 61907688 is 88670916.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44916804 + 16990884 = 6702^2 + 4122^2 .

It is not an unprimeable number, because it can be changed into a prime (61907689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1578 + ... + 11238.

Almost surely, 2^61907688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61907688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84784050).

61907688 is an abundant number, since it is smaller than the sum of its proper divisors (107660412).

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

61907688 is a wasteful number, since it uses less digits than its factorization.

61907688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9762 (or 9755 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 61907688 is about 7868.1438726043. The cubic root of 61907688 is about 395.5926328124.

The spelling of 61907688 in words is "sixty-one million, nine hundred seven thousand, six hundred eighty-eight".