1978269696 has 288 divisors, whose sum is σ = 6459203520. Its totient is φ = 594542592.

The previous prime is 1978269677. The next prime is 1978269779. The reversal of 1978269696 is 6969628791.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×1978269696² = 7827101980223864832, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46006251 + ... + 46006293.

It is an arithmetic number, because the mean of its divisors is an integer number (22427790).

Almost surely, 2^1978269696 is an apocalyptic number.

1978269696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1978269696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3229601760).

1978269696 is an abundant number, since it is smaller than the sum of its proper divisors (4480933824).

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

1978269696 is an frugal number, since it uses more digits than its factorization.

1978269696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 61 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The square root of 1978269696 is about 44477.7438276718. The cubic root of 1978269696 is about 1255.3413453279.

The spelling of 1978269696 in words is "one billion, nine hundred seventy-eight million, two hundred sixty-nine thousand, six hundred ninety-six".