61688455 has 4 divisors (see below), whose sum is σ = 74026152. Its totient is φ = 49350760.

The previous prime is 61688447. The next prime is 61688467. The reversal of 61688455 is 55488616.

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

It is not a de Polignac number, because 61688455 - 2³ = 61688447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6168841 + ... + 6168850.

It is an arithmetic number, because the mean of its divisors is an integer number (18506538).

Almost surely, 2^61688455 is an apocalyptic number.

61688455 is a deficient number, since it is larger than the sum of its proper divisors (12337697).

61688455 is a wasteful number, since it uses less digits than its factorization.

61688455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12337696.

The product of its digits is 230400, while the sum is 43.

The square root of 61688455 is about 7854.1998319371. The cubic root of 61688455 is about 395.1251112523.

The spelling of 61688455 in words is "sixty-one million, six hundred eighty-eight thousand, four hundred fifty-five".