61678997 has 8 divisors (see below), whose sum is σ = 65364000. Its totient is φ = 58037904.

The previous prime is 61678979. The next prime is 61678999. The reversal of 61678997 is 79987616.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61678997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61678999) 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, 8063 + ... + 13724.

It is an arithmetic number, because the mean of its divisors is an integer number (8170500).

Almost surely, 2^61678997 is an apocalyptic number.

It is an amenable number.

61678997 is a deficient number, since it is larger than the sum of its proper divisors (3685003).

61678997 is a wasteful number, since it uses less digits than its factorization.

61678997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21955.

The product of its digits is 1143072, while the sum is 53.

The square root of 61678997 is about 7853.5977106037. The cubic root of 61678997 is about 395.1049168507.

The spelling of 61678997 in words is "sixty-one million, six hundred seventy-eight thousand, nine hundred ninety-seven".