102499478 has 4 divisors (see below), whose sum is σ = 153749220. Its totient is φ = 51249738.

The previous prime is 102499417. The next prime is 102499489. The reversal of 102499478 is 874994201.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×102499478² = 21012285980544968, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25624868 + ... + 25624871.

It is an arithmetic number, because the mean of its divisors is an integer number (38437305).

Almost surely, 2^102499478 is an apocalyptic number.

102499478 is a deficient number, since it is larger than the sum of its proper divisors (51249742).

102499478 is an equidigital number, since it uses as much as digits as its factorization.

102499478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51249741.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 102499478 is about 10124.2025858830. The cubic root of 102499478 is about 467.9942867055.

The spelling of 102499478 in words is "one hundred two million, four hundred ninety-nine thousand, four hundred seventy-eight".