61899807 has 8 divisors (see below), whose sum is σ = 83334784. Its totient is φ = 40865688.

The previous prime is 61899797. The next prime is 61899809. The reversal of 61899807 is 70899816.

It is a happy number.

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

It is not a de Polignac number, because 61899807 - 2⁷ = 61899679 is a prime.

It is a super-2 number, since 2×61899807² = 7663172213274498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61899809) 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, 99853 + ... + 100470.

It is an arithmetic number, because the mean of its divisors is an integer number (10416848).

Almost surely, 2^61899807 is an apocalyptic number.

61899807 is a deficient number, since it is larger than the sum of its proper divisors (21434977).

61899807 is a wasteful number, since it uses less digits than its factorization.

61899807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200429.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 61899807 is about 7867.6430396911. The cubic root of 61899807 is about 395.5758454637.

Subtracting 61899807 from its reverse (70899816), we obtain a palindrome (9000009).

The spelling of 61899807 in words is "sixty-one million, eight hundred ninety-nine thousand, eight hundred seven".