61631748 has 18 divisors (see below), whose sum is σ = 155791454. Its totient is φ = 20543904.

The previous prime is 61631747. The next prime is 61631819. The reversal of 61631748 is 84713616.

61631748 is a `hidden beast` number, since 616 + 31 + 7 + 4 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52881984 + 8749764 = 7272^2 + 2958^2 .

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

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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: 1711993 = 61631748 / (6 + 1 + 6 + 3 + 1 + 7 + 4 + 8).

It is not an unprimeable number, because it can be changed into a prime (61631741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 855961 + ... + 856032.

Almost surely, 2^61631748 is an apocalyptic number.

It is an amenable number.

61631748 is an abundant number, since it is smaller than the sum of its proper divisors (94159706).

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

61631748 is a wasteful number, since it uses less digits than its factorization.

61631748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712003 (or 1711998 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 61631748 is about 7850.5890224874. The cubic root of 61631748 is about 395.0040014550.

The spelling of 61631748 in words is "sixty-one million, six hundred thirty-one thousand, seven hundred forty-eight".