61577816 has 16 divisors (see below), whose sum is σ = 115570800. Its totient is φ = 30758944.

The previous prime is 61577809. The next prime is 61577819. The reversal of 61577816 is 61877516.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61577819) 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, 6701 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (7223175).

Almost surely, 2^61577816 is an apocalyptic number.

It is an amenable number.

61577816 is a deficient number, since it is larger than the sum of its proper divisors (53992984).

61577816 is a wasteful number, since it uses less digits than its factorization.

61577816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7498 (or 7494 counting only the distinct ones).

The product of its digits is 70560, while the sum is 41.

The square root of 61577816 is about 7847.1533692161. The cubic root of 61577816 is about 394.8887493136. Note that the first 3 decimals are identical.

The spelling of 61577816 in words is "sixty-one million, five hundred seventy-seven thousand, eight hundred sixteen".