61591798 has 4 divisors (see below), whose sum is σ = 92387700. Its totient is φ = 30795898.

The previous prime is 61591759. The next prime is 61591813. The reversal of 61591798 is 89719516.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15397948 + ... + 15397951.

It is an arithmetic number, because the mean of its divisors is an integer number (23096925).

Almost surely, 2^61591798 is an apocalyptic number.

61591798 is a deficient number, since it is larger than the sum of its proper divisors (30795902).

61591798 is a wasteful number, since it uses less digits than its factorization.

61591798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30795901.

The product of its digits is 136080, while the sum is 46.

The square root of 61591798 is about 7848.0442149621. The cubic root of 61591798 is about 394.9186351665.

The spelling of 61591798 in words is "sixty-one million, five hundred ninety-one thousand, seven hundred ninety-eight".