61607819 has 16 divisors (see below), whose sum is σ = 78274560. Its totient is φ = 47170080.

The previous prime is 61607801. The next prime is 61607851. The reversal of 61607819 is 91870616.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61607819 is a prime.

It is a super-2 number, since 2×61607819² = 7591046723873522, which contains 22 as substring.

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 not an unprimeable number, because it can be changed into a prime (61606819) 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, 8099 + ... + 13740.

It is an arithmetic number, because the mean of its divisors is an integer number (4892160).

Almost surely, 2^61607819 is an apocalyptic number.

61607819 is a deficient number, since it is larger than the sum of its proper divisors (16666741).

61607819 is a wasteful number, since it uses less digits than its factorization.

61607819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21890.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 61607819 is about 7849.0648487575. The cubic root of 61607819 is about 394.9528737240.

It can be divided in two parts, 61607 and 819, that added together give a palindrome (62426).

The spelling of 61607819 in words is "sixty-one million, six hundred seven thousand, eight hundred nineteen".