61557998 has 8 divisors (see below), whose sum is σ = 92466192. Its totient is φ = 30735936.

The previous prime is 61557997. The next prime is 61558027. The reversal of 61557998 is 89975516.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61557997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19715 + ... + 22622.

It is an arithmetic number, because the mean of its divisors is an integer number (11558274).

Almost surely, 2^61557998 is an apocalyptic number.

61557998 is a deficient number, since it is larger than the sum of its proper divisors (30908194).

61557998 is a wasteful number, since it uses less digits than its factorization.

61557998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43066.

The product of its digits is 680400, while the sum is 50.

The square root of 61557998 is about 7845.8905166973. The cubic root of 61557998 is about 394.8463815398.

The spelling of 61557998 in words is "sixty-one million, five hundred fifty-seven thousand, nine hundred ninety-eight".