61987377 has 4 divisors (see below), whose sum is σ = 82649840. Its totient is φ = 41324916.

The previous prime is 61987361. The next prime is 61987379. The reversal of 61987377 is 77378916.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 61987377 - 2⁴ = 61987361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61987379) 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, 10331227 + ... + 10331232.

It is an arithmetic number, because the mean of its divisors is an integer number (20662460).

Almost surely, 2^61987377 is an apocalyptic number.

It is an amenable number.

61987377 is a deficient number, since it is larger than the sum of its proper divisors (20662463).

61987377 is a wasteful number, since it uses less digits than its factorization.

61987377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20662462.

The product of its digits is 444528, while the sum is 48.

The square root of 61987377 is about 7873.2062719073. The cubic root of 61987377 is about 395.7622986795.

The spelling of 61987377 in words is "sixty-one million, nine hundred eighty-seven thousand, three hundred seventy-seven".