61399910 has 32 divisors (see below), whose sum is σ = 129844512. Its totient is φ = 20609280.

The previous prime is 61399901. The next prime is 61399913. The reversal of 61399910 is 1999316.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61399913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20039 + ... + 22898.

It is an arithmetic number, because the mean of its divisors is an integer number (4057641).

Almost surely, 2^61399910 is an apocalyptic number.

61399910 is an abundant number, since it is smaller than the sum of its proper divisors (68444602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61399910 is a wasteful number, since it uses less digits than its factorization.

61399910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42968.

The product of its (nonzero) digits is 13122, while the sum is 38.

The square root of 61399910 is about 7835.8094668005. The cubic root of 61399910 is about 394.5080881825.

The spelling of 61399910 in words is "sixty-one million, three hundred ninety-nine thousand, nine hundred ten".