61545198 has 48 divisors (see below), whose sum is σ = 145727568. Its totient is φ = 17212800.

The previous prime is 61545193. The next prime is 61545203. The reversal of 61545198 is 89154516.

It is an interprime number because it is at equal distance from previous prime (61545193) and next prime (61545203).

It is a super-2 number, since 2×61545198² = 7575622793718408, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61545193) 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, 6178 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (3035991).

Almost surely, 2^61545198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61545198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72863784).

61545198 is an abundant number, since it is smaller than the sum of its proper divisors (84182370).

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

61545198 is a wasteful number, since it uses less digits than its factorization.

61545198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561 (or 6550 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 61545198 is about 7845.0747606380. The cubic root of 61545198 is about 394.8190123152.

The spelling of 61545198 in words is "sixty-one million, five hundred forty-five thousand, one hundred ninety-eight".