77972145 has 8 divisors (see below), whose sum is σ = 124755456. Its totient is φ = 41585136.

The previous prime is 77972137. The next prime is 77972159. The reversal of 77972145 is 54127977.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77972145 - 2³ = 77972137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77972097 and 77972106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2599057 + ... + 2599086.

It is an arithmetic number, because the mean of its divisors is an integer number (15594432).

Almost surely, 2^77972145 is an apocalyptic number.

It is an amenable number.

77972145 is a deficient number, since it is larger than the sum of its proper divisors (46783311).

77972145 is a wasteful number, since it uses less digits than its factorization.

77972145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5198151.

The product of its digits is 123480, while the sum is 42.

The square root of 77972145 is about 8830.1837466725. The cubic root of 77972145 is about 427.2150010426.

The spelling of 77972145 in words is "seventy-seven million, nine hundred seventy-two thousand, one hundred forty-five".