61377516 has 18 divisors (see below), whose sum is σ = 155148812. Its totient is φ = 20459160.

The previous prime is 61377493. The next prime is 61377521. The reversal of 61377516 is 61577316.

61377516 is a `hidden beast` number, since 6 + 137 + 7 + 516 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1704931 = 61377516 / (6 + 1 + 3 + 7 + 7 + 5 + 1 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 852430 + ... + 852501.

Almost surely, 2^61377516 is an apocalyptic number.

It is an amenable number.

61377516 is an abundant number, since it is smaller than the sum of its proper divisors (93771296).

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

61377516 is a wasteful number, since it uses less digits than its factorization.

61377516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1704941 (or 1704936 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 61377516 is about 7834.3803839232. The cubic root of 61377516 is about 394.4601202055.

The spelling of 61377516 in words is "sixty-one million, three hundred seventy-seven thousand, five hundred sixteen".