61772148 has 36 divisors (see below), whose sum is σ = 156854880. Its totient is φ = 20497296.

The previous prime is 61772143. The next prime is 61772167. The reversal of 61772148 is 84127716.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61772143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4393 + ... + 11951.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^61772148 is an apocalyptic number.

It is an amenable number.

61772148 is an abundant number, since it is smaller than the sum of its proper divisors (95082732).

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

61772148 is a wasteful number, since it uses less digits than its factorization.

61772148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7796 (or 7791 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 61772148 is about 7859.5259399025. The cubic root of 61772148 is about 395.3037198329.

The spelling of 61772148 in words is "sixty-one million, seven hundred seventy-two thousand, one hundred forty-eight".