61639797 has 8 divisors (see below), whose sum is σ = 82364256. Its totient is φ = 41004272.

The previous prime is 61639783. The next prime is 61639843. The reversal of 61639797 is 79793616.

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

It is a cyclic number.

It is not a de Polignac number, because 61639797 - 2⁶ = 61639733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61639757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20598 + ... + 23399.

It is an arithmetic number, because the mean of its divisors is an integer number (10295532).

Almost surely, 2^61639797 is an apocalyptic number.

It is an amenable number.

61639797 is a deficient number, since it is larger than the sum of its proper divisors (20724459).

61639797 is a wasteful number, since it uses less digits than its factorization.

61639797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44467.

The product of its digits is 428652, while the sum is 48.

The square root of 61639797 is about 7851.1016424448. The cubic root of 61639797 is about 395.0211963202.

The spelling of 61639797 in words is "sixty-one million, six hundred thirty-nine thousand, seven hundred ninety-seven".