7628701778 has 16 divisors (see below), whose sum is σ = 12352322880. Its totient is φ = 3522698256.

The previous prime is 7628701763. The next prime is 7628701789. The reversal of 7628701778 is 8771078267.

It is a happy number.

It is a super-2 number, since 2×7628701778² (a number of 21 digits) contains 22 as substring.

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, 2858000 + ... + 2860667.

It is an arithmetic number, because the mean of its divisors is an integer number (772020180).

Almost surely, 2^7628701778 is an apocalyptic number.

7628701778 is a deficient number, since it is larger than the sum of its proper divisors (4723621102).

7628701778 is a wasteful number, since it uses less digits than its factorization.

7628701778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5718721.

The product of its (nonzero) digits is 1843968, while the sum is 53.

The square root of 7628701778 is about 87342.4397300648. The cubic root of 7628701778 is about 1968.5670545274.

The spelling of 7628701778 in words is "seven billion, six hundred twenty-eight million, seven hundred one thousand, seven hundred seventy-eight".