102778540 has 24 divisors (see below), whose sum is σ = 216583920. Its totient is φ = 40968768.

The previous prime is 102778537. The next prime is 102778553. The reversal of 102778540 is 45877201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 102778496 and 102778505.

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, 2910 + ... + 14629.

It is an arithmetic number, because the mean of its divisors is an integer number (9024330).

Almost surely, 2^102778540 is an apocalyptic number.

102778540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102778540 is an abundant number, since it is smaller than the sum of its proper divisors (113805380).

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

102778540 is a wasteful number, since it uses less digits than its factorization.

102778540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17841 (or 17839 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 102778540 is about 10137.9751429958. The cubic root of 102778540 is about 468.4186175773.

The spelling of 102778540 in words is "one hundred two million, seven hundred seventy-eight thousand, five hundred forty".