61808807 has 4 divisors (see below), whose sum is σ = 63123936. Its totient is φ = 60493680.

The previous prime is 61808801. The next prime is 61808819. The reversal of 61808807 is 70880816.

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

It is a cyclic number.

It is not a de Polignac number, because 61808807 - 2¹⁸ = 61546663 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 (61808801) 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, 657494 + ... + 657587.

It is an arithmetic number, because the mean of its divisors is an integer number (15780984).

Almost surely, 2^61808807 is an apocalyptic number.

61808807 is a deficient number, since it is larger than the sum of its proper divisors (1315129).

61808807 is a wasteful number, since it uses less digits than its factorization.

61808807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315128.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 61808807 is about 7861.8577321140. The cubic root of 61808807 is about 395.3819027131.

The spelling of 61808807 in words is "sixty-one million, eight hundred eight thousand, eight hundred seven".