1778019540 has 48 divisors (see below), whose sum is σ = 5431043520. Its totient is φ = 431034880.

The previous prime is 1778019527. The next prime is 1778019553. The reversal of 1778019540 is 459108771.

It is an interprime number because it is at equal distance from previous prime (1778019527) and next prime (1778019553).

It is a super-2 number, since 2×1778019540² = 6322706969243623200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1778019492 and 1778019501.

It is a congruent number.

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, 1346325 + ... + 1347644.

It is an arithmetic number, because the mean of its divisors is an integer number (113146740).

Almost surely, 2^1778019540 is an apocalyptic number.

1778019540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1778019540 is an abundant number, since it is smaller than the sum of its proper divisors (3653023980).

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

1778019540 is a wasteful number, since it uses less digits than its factorization.

1778019540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2693992 (or 2693990 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 1778019540 is about 42166.5689853941. The cubic root of 1778019540 is about 1211.4686399547.

The spelling of 1778019540 in words is "one billion, seven hundred seventy-eight million, nineteen thousand, five hundred forty".