61999776 has 96 divisors (see below), whose sum is σ = 183496320. Its totient is φ = 20362752.

The previous prime is 61999747. The next prime is 61999787. The reversal of 61999776 is 67799916.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62581 + ... + 63563.

It is an arithmetic number, because the mean of its divisors is an integer number (1911420).

Almost surely, 2^61999776 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 61999776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91748160).

61999776 is an abundant number, since it is smaller than the sum of its proper divisors (121496544).

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

61999776 is a wasteful number, since it uses less digits than its factorization.

61999776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075 (or 1061 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 54.

The square root of 61999776 is about 7873.9936499847. The cubic root of 61999776 is about 395.7886843182.

The spelling of 61999776 in words is "sixty-one million, nine hundred ninety-nine thousand, seven hundred seventy-six".