61998455 has 16 divisors (see below), whose sum is σ = 77989824. Its totient is φ = 47224320.

The previous prime is 61998451. The next prime is 61998457. The reversal of 61998455 is 55489916.

It is a happy number.

It is not a de Polignac number, because 61998455 - 2² = 61998451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61998451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26597 + ... + 28833.

It is an arithmetic number, because the mean of its divisors is an integer number (4874364).

Almost surely, 2^61998455 is an apocalyptic number.

61998455 is a deficient number, since it is larger than the sum of its proper divisors (15991369).

61998455 is a wasteful number, since it uses less digits than its factorization.

61998455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2506.

The product of its digits is 388800, while the sum is 47.

The square root of 61998455 is about 7873.9097658025. The cubic root of 61998455 is about 395.7858733372.

The spelling of 61998455 in words is "sixty-one million, nine hundred ninety-eight thousand, four hundred fifty-five".