78652763401 has 3 divisors (see below), whose sum is σ = 78653043853. Its totient is φ = 78652482950.

The previous prime is 78652763393. The next prime is 78652763411. The reversal of 78652763401 is 10436725687.

The square root of 78652763401 is 280451.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 78652763401 - 2³ = 78652763393 is a prime.

It is a super-2 number, since 2×78652763401² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78652763411) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 140226 + ... + 420676.

Almost surely, 2^78652763401 is an apocalyptic number.

78652763401 is the 280451-st square number.

78652763401 is the 140226-th centered octagonal number.

It is an amenable number.

78652763401 is a deficient number, since it is larger than the sum of its proper divisors (280452).

78652763401 is an frugal number, since it uses more digits than its factorization.

78652763401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560902 (or 280451 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

Multiplying 78652763401 by its sum of digits (49), we get a square (3853985406649 = 1963157²).

The spelling of 78652763401 in words is "seventy-eight billion, six hundred fifty-two million, seven hundred sixty-three thousand, four hundred one".