61864398 has 56 divisors (see below), whose sum is σ = 140551056. Its totient is φ = 20412000.

The previous prime is 61864379. The next prime is 61864403. The reversal of 61864398 is 89346816.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 220018 + ... + 220298.

Almost surely, 2^61864398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61864398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70275528).

61864398 is an abundant number, since it is smaller than the sum of its proper divisors (78686658).

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

61864398 is a wasteful number, since it uses less digits than its factorization.

61864398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 437 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 61864398 is about 7865.3924250478. The cubic root of 61864398 is about 395.5004030271.

The spelling of 61864398 in words is "sixty-one million, eight hundred sixty-four thousand, three hundred ninety-eight".