61957998 has 48 divisors (see below), whose sum is σ = 141467040. Its totient is φ = 19559232.

The previous prime is 61957991. The next prime is 61958003. The reversal of 61957998 is 89975916.

61957998 is a `hidden beast` number, since 61 + 9 + 579 + 9 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61957991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44440 + ... + 45812.

It is an arithmetic number, because the mean of its divisors is an integer number (2947230).

Almost surely, 2^61957998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61957998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70733520).

61957998 is an abundant number, since it is smaller than the sum of its proper divisors (79509042).

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

61957998 is a wasteful number, since it uses less digits than its factorization.

61957998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513 (or 1510 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 61957998 is about 7871.3402924788. The cubic root of 61957998 is about 395.6997647760.

The spelling of 61957998 in words is "sixty-one million, nine hundred fifty-seven thousand, nine hundred ninety-eight".