61399716 has 192 divisors, whose sum is σ = 190955520. Its totient is φ = 14929920.

The previous prime is 61399711. The next prime is 61399727. The reversal of 61399716 is 61799316.

61399716 = T₄₄₈ + T₄₄₉ + ... + T₇₇₀.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (61399711) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 841056 + ... + 841128.

It is an arithmetic number, because the mean of its divisors is an integer number (994560).

Almost surely, 2^61399716 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 61399716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95477760).

61399716 is an abundant number, since it is smaller than the sum of its proper divisors (129555804).

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

61399716 is a wasteful number, since it uses less digits than its factorization.

61399716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 152 counting only the distinct ones).

The product of its digits is 61236, while the sum is 42.

The square root of 61399716 is about 7835.7970877250. The cubic root of 61399716 is about 394.5076726843.

The spelling of 61399716 in words is "sixty-one million, three hundred ninety-nine thousand, seven hundred sixteen".