61261998 has 16 divisors (see below), whose sum is σ = 140027520. Its totient is φ = 17503416.

The previous prime is 61261961. The next prime is 61262029. The reversal of 61261998 is 89916216.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1458619 = 61261998 / (6 + 1 + 2 + 6 + 1 + 9 + 9 + 8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 729268 + ... + 729351.

It is an arithmetic number, because the mean of its divisors is an integer number (8751720).

Almost surely, 2^61261998 is an apocalyptic number.

61261998 is an abundant number, since it is smaller than the sum of its proper divisors (78765522).

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

61261998 is a wasteful number, since it uses less digits than its factorization.

61261998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458631.

The product of its digits is 46656, while the sum is 42.

The square root of 61261998 is about 7827.0044078178. The cubic root of 61261998 is about 394.2124949931.

The spelling of 61261998 in words is "sixty-one million, two hundred sixty-one thousand, nine hundred ninety-eight".