61439998 has 8 divisors (see below), whose sum is σ = 94120992. Its totient is φ = 30066336.

The previous prime is 61439971. The next prime is 61439999. The reversal of 61439998 is 89993416.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61439999) 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, 326715 + ... + 326902.

It is an arithmetic number, because the mean of its divisors is an integer number (11765124).

Almost surely, 2^61439998 is an apocalyptic number.

61439998 is a deficient number, since it is larger than the sum of its proper divisors (32680994).

61439998 is a wasteful number, since it uses less digits than its factorization.

61439998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653666.

The product of its digits is 419904, while the sum is 49.

The square root of 61439998 is about 7838.3670493286. The cubic root of 61439998 is about 394.5939276113.

The spelling of 61439998 in words is "sixty-one million, four hundred thirty-nine thousand, nine hundred ninety-eight".