7664128377 has 8 divisors (see below), whose sum is σ = 10819946016. Its totient is φ = 4808864832.

The previous prime is 7664128369. The next prime is 7664128387. The reversal of 7664128377 is 7738214667.

It is a happy number.

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

It is not a de Polignac number, because 7664128377 - 2³ = 7664128369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 150277027 = 7664128377 / (7 + 6 + 6 + 4 + 1 + 2 + 8 + 3 + 7 + 7).

It is not an unprimeable number, because it can be changed into a prime (7664128387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75138463 + ... + 75138564.

It is an arithmetic number, because the mean of its divisors is an integer number (1352493252).

Almost surely, 2^7664128377 is an apocalyptic number.

It is an amenable number.

7664128377 is a deficient number, since it is larger than the sum of its proper divisors (3155817639).

7664128377 is a wasteful number, since it uses less digits than its factorization.

7664128377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150277047.

The product of its digits is 2370816, while the sum is 51.

The square root of 7664128377 is about 87545.0077217428. The cubic root of 7664128377 is about 1971.6095975312.

The spelling of 7664128377 in words is "seven billion, six hundred sixty-four million, one hundred twenty-eight thousand, three hundred seventy-seven".