78400150 has 24 divisors (see below), whose sum is σ = 146646864. Its totient is φ = 31183200.

The previous prime is 78400129. The next prime is 78400171. The reversal of 78400150 is 5100487.

It is an interprime number because it is at equal distance from previous prime (78400129) and next prime (78400171).

It is a super-2 number, since 2×78400150² = 12293167040045000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4719 + ... + 13381.

It is an arithmetic number, because the mean of its divisors is an integer number (6110286).

Almost surely, 2^78400150 is an apocalyptic number.

78400150 is a deficient number, since it is larger than the sum of its proper divisors (68246714).

78400150 is a wasteful number, since it uses less digits than its factorization.

78400150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856 (or 8851 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 78400150 is about 8854.3859188540. The cubic root of 78400150 is about 427.9952651818.

The spelling of 78400150 in words is "seventy-eight million, four hundred thousand, one hundred fifty".