61772865 has 64 divisors (see below), whose sum is σ = 124968960. Its totient is φ = 25309440.

The previous prime is 61772827. The next prime is 61772873. The reversal of 61772865 is 56827716.

It is not a de Polignac number, because 61772865 - 2¹³ = 61764673 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 90907 + ... + 91583.

It is an arithmetic number, because the mean of its divisors is an integer number (1952640).

Almost surely, 2^61772865 is an apocalyptic number.

It is an amenable number.

61772865 is an abundant number, since it is smaller than the sum of its proper divisors (63196095).

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

61772865 is a wasteful number, since it uses less digits than its factorization.

61772865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782.

The product of its digits is 141120, while the sum is 42.

The square root of 61772865 is about 7859.5715532082. The cubic root of 61772865 is about 395.3052492799.

The spelling of 61772865 in words is "sixty-one million, seven hundred seventy-two thousand, eight hundred sixty-five".